diff --git a/backend/app/ledger_runtime.py b/backend/app/ledger_runtime.py
index c1a1958..2f2e41c 100644
--- a/backend/app/ledger_runtime.py
+++ b/backend/app/ledger_runtime.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import hashlib
 import json
 from pathlib import Path
+from urllib.parse import quote
 
 from fastapi import HTTPException
 from fastapi.responses import FileResponse, Response
@@ -88,7 +89,7 @@ def build_business_ledger_default_response(cur) -> Response:
     headers = {
         "Content-Disposition": 'inline; filename="business-ledger-default.xlsx"',
         "X-Source-Filename": "business-ledger-default.xlsx",
-        "X-Original-Filename": filename,
+        "X-Original-Filename": quote(filename),
         "Cache-Control": "no-store, no-cache, must-revalidate, max-age=0",
         "Pragma": "no-cache",
     }
diff --git a/backend/app/main.py b/backend/app/main.py
index be4afcf..88f2abb 100755
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1663,6 +1663,11 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
                         "member_id": int(member["id"]),
                         "name": str(member.get("name") or "-"),
                         "rank": str(member.get("rank") or "-"),
+                        "team": str(member.get("team") or ""),
+                        "department": str(member.get("department") or ""),
+                        "grp": str(member.get("grp") or ""),
+                        "division": str(member.get("division") or ""),
+                        "cell": str(member.get("cell") or ""),
                     }
                 )
 
@@ -1844,6 +1849,40 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
       return seatAssignments.get(String(key)) || null;
     }
 
+    function getTeamTone(teamName) {
+      const team = String(teamName || "").trim();
+      if (!team) {
+        return { accent: "rgba(120, 132, 119, 0.86)", soft: "rgba(120, 132, 119, 0.18)", label: "미분류" };
+      }
+      const palette = [
+        { accent: "rgba(13, 148, 136, 0.9)", soft: "rgba(13, 148, 136, 0.18)" },
+        { accent: "rgba(202, 138, 4, 0.9)", soft: "rgba(202, 138, 4, 0.18)" },
+        { accent: "rgba(5, 150, 105, 0.9)", soft: "rgba(5, 150, 105, 0.18)" },
+        { accent: "rgba(180, 83, 9, 0.9)", soft: "rgba(180, 83, 9, 0.18)" },
+        { accent: "rgba(20, 83, 45, 0.9)", soft: "rgba(20, 83, 45, 0.16)" },
+        { accent: "rgba(11, 110, 79, 0.9)", soft: "rgba(11, 110, 79, 0.18)" },
+      ];
+      let hash = 0;
+      for (const char of team) {
+        hash = ((hash * 31) + char.charCodeAt(0)) % 2147483647;
+      }
+      return { ...palette[Math.abs(hash) % palette.length], label: team };
+    }
+
+    function getAssignmentGroupLabel(assignment) {
+      return String((assignment && assignment.team) || "").trim();
+    }
+
+    function notifyParentSelection(assignment) {
+      window.parent.postMessage(
+        {
+          type: "seatmap-member-selected",
+          memberId: assignment ? Number(assignment.memberId || 0) : null,
+        },
+        window.location.origin,
+      );
+    }
+
     function hideSeatPopup() {
       popup.hidden = true;
       popup.innerHTML = "";
@@ -1870,6 +1909,7 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
       popup.innerHTML = `
         <strong>${assignment.name}</strong>
         <div>직급: ${assignment.rank || "-"}</div>
+        <div>팀: ${assignment.team || "미분류"}</div>
         <div>상태: 배치완료</div>
         ${viewerMode === "default" ? `<button type="button" data-seatmap-delete="${chairKey}">자리 비우기</button>` : ""}
       `;
@@ -1908,6 +1948,11 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
           key,
           name: item.name || "-",
           rank: item.rank || "-",
+          team: item.team || "",
+          department: item.department || "",
+          grp: item.grp || "",
+          division: item.division || "",
+          cell: item.cell || "",
           memberId: Number(item.member_id || 0),
         };
         seatAssignments.set(key, assignment);
@@ -1974,11 +2019,67 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
         focusedChairPulseUntil = 0;
       }
       if (!seatAssignments.size) return;
-      ctx.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
-      ctx.textBaseline = "middle";
+      const groupRects = new Map();
       for (const chair of chairGeometry) {
         const assignment = getAssignment(chair.key);
         if (!assignment) continue;
+        const label = getAssignmentGroupLabel(assignment);
+        if (!groupRects.has(label)) {
+          groupRects.set(label, {
+            label,
+            tone: getTeamTone(label),
+            minX: chair.minX,
+            maxX: chair.maxX,
+            minY: chair.minY,
+            maxY: chair.maxY,
+            count: 1,
+          });
+          continue;
+        }
+        const group = groupRects.get(label);
+        group.minX = Math.min(group.minX, chair.minX);
+        group.maxX = Math.max(group.maxX, chair.maxX);
+        group.minY = Math.min(group.minY, chair.minY);
+        group.maxY = Math.max(group.maxY, chair.maxY);
+        group.count += 1;
+      }
+      ctx.setTransform(pixelRatio, 0, 0, pixelRatio, 0, 0);
+      ctx.textBaseline = "middle";
+      for (const group of groupRects.values()) {
+        if (!group.label || group.count < 2) continue;
+        const topLeft = worldToScreen(group.minX, group.maxY);
+        const bottomRight = worldToScreen(group.maxX, group.minY);
+        const pad = Math.max(26, 24 + camera.scale * 2200);
+        const boxX = Math.min(topLeft.x, bottomRight.x) - pad;
+        const boxY = Math.min(topLeft.y, bottomRight.y) - pad;
+        const boxWidth = Math.abs(bottomRight.x - topLeft.x) + pad * 2;
+        const boxHeight = Math.abs(bottomRight.y - topLeft.y) + pad * 2;
+        ctx.save();
+        const softFill = group.tone.soft
+          .replace("0.16", "0.24")
+          .replace("0.18", "0.28");
+        ctx.fillStyle = softFill;
+        ctx.strokeStyle = group.tone.accent;
+        ctx.lineWidth = 2.6;
+        ctx.shadowColor = group.tone.accent.replace("0.9", "0.18");
+        ctx.shadowBlur = 10;
+        ctx.beginPath();
+        ctx.roundRect(boxX, boxY, boxWidth, boxHeight, 22);
+        ctx.fill();
+        ctx.stroke();
+        ctx.fillStyle = "rgba(255,255,255,0.96)";
+        ctx.beginPath();
+        ctx.roundRect(boxX + 14, boxY + 14, Math.max(72, group.label.length * 12), 28, 999);
+        ctx.fill();
+        ctx.fillStyle = group.tone.accent;
+        ctx.font = "900 12px Pretendard, sans-serif";
+        ctx.fillText(group.label, boxX + 26, boxY + 28);
+        ctx.restore();
+      }
+      for (const chair of chairGeometry) {
+        const assignment = getAssignment(chair.key);
+        if (!assignment) continue;
+        const tone = getTeamTone(assignment.team);
         const center = worldToScreen((chair.minX + chair.maxX) / 2, (chair.minY + chair.maxY) / 2);
         if (center.x < -120 || center.x > rect.width + 120 || center.y < -50 || center.y > rect.height + 50) continue;
         const primary = `${assignment.name}`;
@@ -1992,7 +2093,7 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
         const boxX = center.x - boxWidth / 2;
         const boxY = center.y - 46;
         ctx.fillStyle = "rgba(255,255,255,0.96)";
-        ctx.strokeStyle = "rgba(220,38,38,0.18)";
+        ctx.strokeStyle = tone.accent;
         ctx.lineWidth = 1;
         ctx.beginPath();
         ctx.roundRect(boxX, boxY, boxWidth, boxHeight, 10);
@@ -2001,7 +2102,7 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
         ctx.fillStyle = "#111827";
         ctx.font = "700 12px Pretendard, sans-serif";
         ctx.fillText(primary, boxX + 10, boxY + 12);
-        ctx.fillStyle = "#6b7280";
+        ctx.fillStyle = tone.accent;
         ctx.font = "600 10px Pretendard, sans-serif";
         ctx.fillText(secondary, boxX + 10, boxY + 25);
       }
@@ -2032,12 +2133,18 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
       if (!picked) {
         selectedChairKey = null;
         hideSeatPopup();
+        notifyParentSelection(null);
         if (typeof requestDraw === "function") requestDraw();
         return;
       }
       selectedChairKey = seatAssignments.has(String(picked.key)) ? String(picked.key) : null;
-      if (selectedChairKey) showSeatPopup(selectedChairKey, event.clientX - rect.left, event.clientY - rect.top);
-      else hideSeatPopup();
+      if (selectedChairKey) {
+        showSeatPopup(selectedChairKey, event.clientX - rect.left, event.clientY - rect.top);
+        notifyParentSelection(getAssignment(selectedChairKey));
+      } else {
+        hideSeatPopup();
+        notifyParentSelection(null);
+      }
       if (typeof requestDraw === "function") requestDraw();
     });
 
diff --git a/docs/NEXT_SESSION_CHECKPOINT.md b/docs/NEXT_SESSION_CHECKPOINT.md
index 3f7b9a1..f3efe97 100644
--- a/docs/NEXT_SESSION_CHECKPOINT.md
+++ b/docs/NEXT_SESSION_CHECKPOINT.md
@@ -132,11 +132,33 @@
 ## Open Issues Relevant Now
 
 - `#2` 백엔드 영속 저장 구조 운영 마무리
+- `#7` 자리배치도 팀별 구역 색상 오버레이
+- `#8` 자리배치도 좌석 클릭 시 개인 상위 조직 트리 표시
 - `#14` 누적된 임시 로직 정리 및 중복 코드 제거
 - `#16` 사업관리대장 메인 후속 정리 및 기준 분석
 - `#19` 8081 백엔드 라우터/서빙 deeper 모듈 분리
 - `#21` organization 레거시 구조 승격 및 장기 고도화
 
+## Current Seatmap Work Note
+
+- `#8`:
+  - 자리배치도 우측 패널에 선택 인원 상위 조직 트리 표시 로직을 추가했다.
+  - 좌석 클릭 / 구성원 카드 클릭 / fixed viewer 선택 이벤트가 부모 화면으로 올라오도록 연결했다.
+  - 검색 카드 클릭은 상단 패널을 띄우지 않고 좌석 포커스만 하도록 분리했다.
+- `#7`:
+  - 해석 기준은 `개별 좌석 색칠`이 아니라 `팀이 모여 있는 좌석 군집을 하나의 구역처럼 보여주는 오버레이`다.
+  - grid 배치도와 fixed/DXF viewer 양쪽에 팀 구역 오버레이 코드를 넣었다.
+  - 현재 증상은 `처음 반짝 보였다가 사라지는 현상`이며, 데이터 부재가 아니라 viewer draw/layer 타이밍 문제로 보인다.
+  - 다음 작업 시작 시 `#7`을 먼저 재확인한다.
+- 자리배치도 카드 텍스트 규칙:
+  - `이름 - 직급 - 팀(또는 다음 조직 fallback)` 순서
+  - 검색 목록 카드에는 `chair-00` 같은 좌석 배지를 노출하지 않음
+  - 미배치 인원 카드는 외곽선만 사용하고 내부 채움색은 사용하지 않음
+- 사업관리대장 기본 원본 API 오류:
+  - 원인은 DB가 아니라 `X-Original-Filename` 한글 헤더 인코딩 오류였음
+  - [backend/app/ledger_runtime.py](/home/hyunho/projects/mh-dashboard-organization/.dev-worktree-8081/backend/app/ledger_runtime.py) 에서 URL-encoded 헤더로 수정
+  - `./scripts/check_8081_smoke.sh` 에 `ledger-default-api` 체크를 넣음
+
 ## Recommended Next Work Order
 
 1. `#2` 기준으로 DB 상태 화면과 저장 구조 검증 흐름 고도화
@@ -156,3 +178,4 @@
 - `#2` 기준 DB 상태 확인은 `/api/admin/db-status` 또는 허브의 `DB 상태` 탭(`/db-status.html`)을 먼저 본다.
 - DB 테이블 유지/주의/원본·추적/정리 후보 분류는 [architecture/DB_TABLE_CATALOG.md](/home/hyunho/projects/mh-dashboard-organization/.dev-worktree-8081/docs/architecture/DB_TABLE_CATALOG.md) 기준으로 본다.
 - 작업 전 `git status`, dev 컨테이너 상태, `/api/health`, `/legacy/organization`, `/integrations/payment`, `/integrations/ledger`, `/integrations/mh`, `/api/admin/db-status`를 먼저 확인
+- 구조 정리나 라우트 변경 직후에는 `./scripts/check_8081_smoke.sh` 를 먼저 실행해 `ledger-default-api` 까지 확인
diff --git a/docs/REGRESSION_CHECKLIST.md b/docs/REGRESSION_CHECKLIST.md
index 3cd1661..ac6509a 100644
--- a/docs/REGRESSION_CHECKLIST.md
+++ b/docs/REGRESSION_CHECKLIST.md
@@ -27,6 +27,7 @@
 - `docker compose ps`에서 `backend`, `frontend`, `proxy`, `db`가 정상인지 확인
 - `8081`은 기본적으로 `./scripts/start_8081.sh` 또는 `./scripts/prepare_dev_worktree.sh` 후 `.dev-worktree-8081` 에서 `docker compose -p mh-dashboard-organization-dev --env-file .env -f docker-compose.8081.yml up -d --build` 로 기동
 - `8081` 기동 후 `docker inspect mh-dashboard-organization-dev-backend-1`에서 마운트 경로가 `.dev-worktree-8081/...`인지 확인
+- 구조 정리, 라우트 분리, 기본 원본 API 변경 후에는 먼저 `./scripts/check_8081_smoke.sh` 를 실행한다
 
 ### 2. 데이터 동기화 범위 결정
 
@@ -52,6 +53,7 @@
 - 메인 허브가 정상 렌더링된다.
 - 상단 탭 이동이 정상 동작한다.
 - 로그인 상태가 비정상적으로 풀리지 않는다.
+- `DB 상태` 탭이 정상 렌더링된다.
 
 ### B. 조직현황
 
@@ -100,6 +102,12 @@
 - `GPD`, `TDC` 선택 시 각 소속 범위만 버튼 기준으로 보인다.
 - 검색은 버튼 상태와 무관하게 전체 데이터를 검색한다.
 
+### G. 사업관리대장 기본 원본
+
+- `/api/integration/business-ledger-default` 가 `200` 이어야 한다.
+- `사업관리대장` 탭 진입 시 기본 원본이 비어 있지 않다.
+- 기본 원본 응답은 바이너리 XLSX 시그니처(`PK`)를 반환해야 한다.
+
 ## 작업 유형별 필수 추가 확인
 
 ### 조직도 / 관리자모드 수정 시
diff --git a/docs/WORK_EXECUTION_FLOW.md b/docs/WORK_EXECUTION_FLOW.md
index 6136f17..7ea207a 100644
--- a/docs/WORK_EXECUTION_FLOW.md
+++ b/docs/WORK_EXECUTION_FLOW.md
@@ -158,6 +158,7 @@
 
 - DB 동기화
 - 코드/worktree 동기화
+- 구조 정리나 서빙 경로 수정 직후에는 `./scripts/check_8081_smoke.sh` 로 핵심 런타임을 먼저 확인
 
 ## 6. 실제 실행
 
diff --git a/docs/WORK_RULEBOOK.md b/docs/WORK_RULEBOOK.md
index 7aee334..918e91a 100644
--- a/docs/WORK_RULEBOOK.md
+++ b/docs/WORK_RULEBOOK.md
@@ -119,6 +119,7 @@
 검증 기준 문서:
 
 - `docs/REGRESSION_CHECKLIST.md`
+- 구조 정리, 라우트 분리, 기본 원본 API 변경 후에는 `./scripts/check_8081_smoke.sh` 를 먼저 통과시킨다.
 
 ## Rule 7. Seat Map Work Is High Risk
 
diff --git a/frontend/public/app.js b/frontend/public/app.js
index f7814ee..5ef280a 100644
--- a/frontend/public/app.js
+++ b/frontend/public/app.js
@@ -50,6 +50,7 @@ const seatMapDom = {
     formGap: null,
     formImage: document.getElementById("seatmap-admin-form-image"),
     search: document.getElementById("seatmap-admin-search"),
+    context: document.getElementById("seatmap-admin-context"),
     unassigned: document.getElementById("seatmap-admin-unassigned"),
     officeTabs: document.getElementById("seatmap-admin-office-tabs"),
     sidebarTitle: document.getElementById("seatmap-admin-sidebar-title"),
@@ -75,6 +76,7 @@ const seatMapDom = {
     formGap: null,
     formImage: null,
     search: document.getElementById("seatmap-readonly-search"),
+    context: document.getElementById("seatmap-readonly-context"),
     unassigned: document.getElementById("seatmap-readonly-unassigned"),
     officeTabs: document.getElementById("seatmap-readonly-office-tabs"),
     sidebarTitle: document.getElementById("seatmap-readonly-sidebar-title"),
@@ -100,6 +102,7 @@ let seatMapFormCols = seatMapDom.admin.formCols;
 let seatMapFormGap = seatMapDom.admin.formGap;
 let seatMapFormImage = seatMapDom.admin.formImage;
 let seatMapSearch = seatMapDom.admin.search;
+let seatMapContext = seatMapDom.admin.context;
 let seatMapUnassigned = seatMapDom.admin.unassigned;
 let seatMapOfficeTabs = seatMapDom.admin.officeTabs;
 let seatMapSidebarTitle = seatMapDom.admin.sidebarTitle;
@@ -135,6 +138,7 @@ const seatMapState = {
   search: "",
   status: "",
   statusTone: "info",
+  selectedMemberId: null,
   draggingMemberId: null,
   zoom: 1,
   panning: false,
@@ -491,6 +495,7 @@ function syncSeatMapDomRefs() {
   seatMapFormGap = dom.formGap;
   seatMapFormImage = dom.formImage;
   seatMapSearch = dom.search;
+  seatMapContext = dom.context;
   seatMapUnassigned = dom.unassigned;
   seatMapOfficeTabs = dom.officeTabs;
   seatMapSidebarTitle = dom.sidebarTitle;
@@ -837,6 +842,98 @@ function getMemberMap() {
   return new Map(seatMapState.members.map((member) => [Number(member.id), member]));
 }
 
+function buildSeatMapTeamTone(teamName) {
+  const team = String(teamName || "").trim();
+  if (!team) {
+    return {
+      accent: "rgba(120, 132, 119, 0.86)",
+      soft: "rgba(120, 132, 119, 0.18)",
+      label: "미분류",
+    };
+  }
+  const palette = [
+    { accent: "rgba(13, 148, 136, 0.9)", soft: "rgba(13, 148, 136, 0.18)" },
+    { accent: "rgba(202, 138, 4, 0.9)", soft: "rgba(202, 138, 4, 0.18)" },
+    { accent: "rgba(5, 150, 105, 0.9)", soft: "rgba(5, 150, 105, 0.18)" },
+    { accent: "rgba(180, 83, 9, 0.9)", soft: "rgba(180, 83, 9, 0.18)" },
+    { accent: "rgba(20, 83, 45, 0.9)", soft: "rgba(20, 83, 45, 0.16)" },
+    { accent: "rgba(11, 110, 79, 0.9)", soft: "rgba(11, 110, 79, 0.18)" },
+  ];
+  let hash = 0;
+  for (const char of team) {
+    hash = ((hash * 31) + char.charCodeAt(0)) % 2147483647;
+  }
+  const picked = palette[Math.abs(hash) % palette.length];
+  return { ...picked, label: team };
+}
+
+function getSeatMapTeamStyle(member) {
+  const tone = buildSeatMapTeamTone(getSeatMapOrgUnitLabel(member));
+  return `--seatmap-team-accent:${tone.accent}; --seatmap-team-soft:${tone.soft};`;
+}
+
+function renderSeatMapTeamChip(member) {
+  const label = getSeatMapOrgUnitLabel(member);
+  const tone = buildSeatMapTeamTone(label);
+  return `<span class="seatmap-team-chip" style="${escapeHtml(getSeatMapTeamStyle({ team: label }))}">${escapeHtml(label)}</span>`;
+}
+
+function getSeatMapOrgPath(member) {
+  const values = [
+    member?.department,
+    member?.grp,
+    member?.division,
+    member?.team,
+    member?.cell,
+  ]
+    .map((value) => String(value || "").trim())
+    .filter(Boolean);
+  return values.filter((value, index) => values.indexOf(value) === index);
+}
+
+function getSeatMapOrgUnitLabel(member) {
+  return String(
+    member?.team
+    || member?.division
+    || member?.grp
+    || member?.department
+    || member?.cell
+    || "미분류"
+  ).trim() || "미분류";
+}
+
+function getSeatMapOverlayTeamLabel(member) {
+  return String(member?.team || "").trim();
+}
+
+function renderSeatMapMemberContext(memberId) {
+  if (!seatMapContext) return;
+  const member = memberId ? getMemberMap().get(Number(memberId)) : null;
+  seatMapState.selectedMemberId = member ? Number(member.id) : null;
+  if (!member) {
+    seatMapContext.classList.add("hidden");
+    seatMapContext.innerHTML = "";
+    return;
+  }
+  const tone = buildSeatMapTeamTone(member.team);
+  const orgPath = getSeatMapOrgPath(member);
+  seatMapContext.classList.remove("hidden");
+  seatMapContext.innerHTML = `
+    <div class="seatmap-context-head">
+      <div class="seatmap-context-title">
+        <strong>${escapeHtml(member.name || "-")}</strong>
+        <span>${escapeHtml(member.rank || member.role || "구성원")}</span>
+      </div>
+      <span class="seatmap-context-badge" style="${escapeHtml(getSeatMapTeamStyle(member))}">${escapeHtml(tone.label)}</span>
+    </div>
+    <div class="seatmap-context-tree">
+      ${orgPath.length
+        ? orgPath.map((item) => `<span class="seatmap-context-node">${escapeHtml(item)}</span>`).join("")
+        : '<div class="seatmap-context-empty">표시할 상위 조직 정보가 없습니다.</div>'}
+    </div>
+  `;
+}
+
 function getPlacementForMember(memberId) {
   return getPlacementSource().find((item) => Number(item.member_id) === Number(memberId)) || null;
 }
@@ -871,9 +968,13 @@ function getSidebarMembers() {
   return members.filter(memberMatchesSeatMapSearch);
 }
 
-function focusSeatMapMember(memberId) {
+function focusSeatMapMember(memberId, options = {}) {
+  const showContext = options.showContext !== false;
   const placement = getPlacementForMember(memberId);
   const member = getMemberMap().get(Number(memberId));
+  if (showContext) {
+    renderSeatMapMemberContext(memberId);
+  }
   if (!placement) {
     setSeatMapStatus("해당 인원은 아직 배치되지 않았습니다.", "info");
     return;
@@ -943,6 +1044,46 @@ function getSlotPlacementMap() {
   return slotMap;
 }
 
+function buildSeatMapGridTeamOverlays(rows, cols, placementMap, memberMap) {
+  const groups = new Map();
+  placementMap.forEach((placement) => {
+    const member = memberMap.get(Number(placement.member_id));
+    if (!member) return;
+    const label = getSeatMapOverlayTeamLabel(member);
+    if (!label) return;
+    const rowIndex = Number(placement.row_index);
+    const colIndex = Number(placement.col_index);
+    if (!Number.isFinite(rowIndex) || !Number.isFinite(colIndex)) return;
+    if (!groups.has(label)) {
+      groups.set(label, {
+        label,
+        toneMember: { team: label },
+        minRow: rowIndex,
+        maxRow: rowIndex,
+        minCol: colIndex,
+        maxCol: colIndex,
+        count: 1,
+      });
+      return;
+    }
+    const group = groups.get(label);
+    group.minRow = Math.min(group.minRow, rowIndex);
+    group.maxRow = Math.max(group.maxRow, rowIndex);
+    group.minCol = Math.min(group.minCol, colIndex);
+    group.maxCol = Math.max(group.maxCol, colIndex);
+    group.count += 1;
+  });
+  return Array.from(groups.values())
+    .filter((group) => group.count >= 2 && group.maxRow < rows && group.maxCol < cols)
+    .map((group) => `
+      <div
+        class="seatmap-team-overlay"
+        data-team-label="${escapeHtml(group.label)}"
+        style="${escapeHtml(getSeatMapTeamStyle(group.toneMember))}; grid-column:${group.minCol + 1} / ${group.maxCol + 2}; grid-row:${group.minRow + 1} / ${group.maxRow + 2};"
+      ></div>
+    `);
+}
+
 function upsertDraftPlacement(memberId, rowIndex, colIndex) {
   const cellMap = getCellPlacementMap();
   const existing = cellMap.get(`${rowIndex}:${colIndex}`);
@@ -1003,11 +1144,12 @@ function renderMemberCard(member, draggable) {
     ? `<span class="seatmap-member-avatar"><img src="${photoUrl}" alt="${escapeHtml(member.name)}"></span>`
     : `<span class="seatmap-member-avatar seatmap-member-avatar-fallback">${escapeHtml(getInitials(member.name))}</span>`;
   return `
-    <div class="seatmap-member-card${draggable ? " draggable" : ""}" draggable="${draggable}" data-member-id="${Number(member.id)}">
+    <div class="seatmap-member-card team-colored${draggable ? " draggable" : ""}" style="${escapeHtml(getSeatMapTeamStyle(member))}" draggable="${draggable}" data-member-id="${Number(member.id)}">
       ${avatar}
       <span class="seatmap-member-text">
         <strong>${escapeHtml(member.name || "-")}</strong>
-        <em>${escapeHtml(member.department || member.team || member.rank || "-")}</em>
+        <em>${escapeHtml(member.rank || "-")}</em>
+        <span class="seatmap-team-chip" style="${escapeHtml(getSeatMapTeamStyle({ team: getSeatMapOrgUnitLabel(member) }))}">${escapeHtml(getSeatMapOrgUnitLabel(member))}</span>
       </span>
     </div>
   `;
@@ -1015,11 +1157,12 @@ function renderMemberCard(member, draggable) {
 
 function renderUnassignedMemberCard(member, draggable) {
   return `
-    <div class="seatmap-member-card seatmap-member-card-compact${draggable ? " draggable" : ""}" draggable="${draggable}" data-member-id="${Number(member.id)}">
+    <div class="seatmap-member-card seatmap-member-card-compact${draggable ? " draggable" : ""}" style="${escapeHtml(getSeatMapTeamStyle(member))}" draggable="${draggable}" data-member-id="${Number(member.id)}">
       <span class="seatmap-member-text seatmap-member-text-inline">
         <strong>${escapeHtml(member.name || "-")}</strong>
         <em>${escapeHtml(member.rank || "-")}</em>
       </span>
+      ${renderSeatMapTeamChip(member)}
     </div>
   `;
 }
@@ -1027,14 +1170,13 @@ function renderUnassignedMemberCard(member, draggable) {
 function renderSeatMapSearchCard(member) {
   const placement = getPlacementForMember(Number(member.id));
   if (!placement) return "";
-  const badge = `<span class="seatmap-member-badge occupied">${escapeHtml(placement.seat_label || "배치완료")}</span>`;
   return `
     <button class="seatmap-member-search-card" type="button" data-member-id="${Number(member.id)}">
       <span class="seatmap-member-text seatmap-member-text-inline">
         <strong>${escapeHtml(member.name || "-")}</strong>
-        <em>${escapeHtml(member.rank || member.department || "-")}</em>
+        <em>${escapeHtml(member.rank || "-")}</em>
       </span>
-      ${badge}
+      ${renderSeatMapTeamChip(member)}
     </button>
   `;
 }
@@ -1054,14 +1196,16 @@ function renderSeatMapBoard() {
   const gap = Number(seatMapState.seatMap.cell_gap || 0);
   const editable = seatMapState.editMode && isAdmin();
   const cells = [];
+  const overlays = buildSeatMapGridTeamOverlays(rows, cols, placementMap, memberMap);
 
   for (let rowIndex = 0; rowIndex < rows; rowIndex += 1) {
     for (let colIndex = 0; colIndex < cols; colIndex += 1) {
       const key = `${rowIndex}:${colIndex}`;
       const placement = placementMap.get(key);
       const member = placement ? memberMap.get(Number(placement.member_id)) : null;
+      const teamStyle = member ? ` style="${escapeHtml(getSeatMapTeamStyle(member))}"` : "";
       cells.push(`
-        <div class="seatmap-cell${placement ? " occupied" : ""}${editable ? " editable" : ""}" data-row="${rowIndex}" data-col="${colIndex}">
+        <div class="seatmap-cell${placement ? " occupied" : ""}${member ? " team-colored" : ""}${editable ? " editable" : ""}" data-row="${rowIndex}" data-col="${colIndex}"${teamStyle}>
           <span class="seatmap-cell-label">${escapeHtml(computeSeatLabel(rowIndex, colIndex))}</span>
           ${member ? renderMemberCard(member, editable) : ""}
         </div>
@@ -1072,7 +1216,7 @@ function renderSeatMapBoard() {
   seatMapBoard.innerHTML = `
     <div class="seatmap-canvas" style="--seatmap-rows:${rows}; --seatmap-cols:${cols}; --seatmap-gap:${gap}px;">
       <img class="seatmap-image" src="${escapeHtml(seatMapState.seatMap.image_url)}" alt="${escapeHtml(seatMapState.seatMap.name)}">
-      <div class="seatmap-grid">${cells.join("")}</div>
+      <div class="seatmap-grid">${overlays.join("")}${cells.join("")}</div>
     </div>
   `;
 }
@@ -1175,6 +1319,7 @@ function renderSeatMapActions() {
 function updateSeatMapDraftUi() {
   renderSeatMapActions();
   renderUnassignedMembers();
+  renderSeatMapMemberContext(seatMapState.selectedMemberId);
   syncSeatMapViewerFrame();
 }
 
@@ -1394,6 +1539,9 @@ function handleEmbeddedNavigationMessage(event) {
       updateSeatMapDraftUi();
     }
   }
+  if (data.type === "seatmap-member-selected") {
+    renderSeatMapMemberContext(Number(data.memberId || 0) || null);
+  }
 }
 
 async function fetchJson(url, options) {
@@ -1437,6 +1585,7 @@ async function loadSeatMapData(force = false) {
     seatMapState.placements = clonePlacements(layoutPayload.placements || []);
     seatMapState.zoom = 1;
     seatMapState.hoveredSlotId = null;
+    seatMapState.selectedMemberId = null;
     seatMapState.editMode = canEditSeatMap();
     resetSeatMapDraft();
     seatMapState.loaded = true;
@@ -1450,6 +1599,7 @@ async function loadSeatMapData(force = false) {
       seatMapState.placements = [];
       seatMapState.zoom = 1;
       seatMapState.hoveredSlotId = null;
+      seatMapState.selectedMemberId = null;
       seatMapState.editMode = canEditSeatMap();
       resetSeatMapDraft();
       seatMapState.loaded = true;
@@ -1690,7 +1840,7 @@ function setActiveView(view) {
     dbStatusFrame.src = resolveAppUrl(frameSrc);
   }
   if (isSeatMapAdmin || isSeatMapReadonly) {
-    loadSeatMapData();
+    loadSeatMapData(previousView !== currentView);
   }
   notifyEmbeddedTabActivated();
 }
@@ -1886,14 +2036,15 @@ Object.values(seatMapDom).forEach((dom) => {
   });
 
   dom.unassigned?.addEventListener("click", (event) => {
-    const button = event.target.closest("[data-member-id]");
-    if (!button) return;
-    if (button.classList.contains("seatmap-member-search-card")) {
-      focusSeatMapMember(Number(button.dataset.memberId));
+    const target = event.target.closest("[data-member-id]");
+    if (!target) return;
+    if (target.classList.contains("seatmap-member-search-card")) {
+      focusSeatMapMember(Number(target.dataset.memberId), { showContext: false });
       return;
     }
+    renderSeatMapMemberContext(Number(target.dataset.memberId));
     if (canEditSeatMap()) return;
-    focusSeatMapMember(Number(button.dataset.memberId));
+    focusSeatMapMember(Number(target.dataset.memberId));
   });
   dom.unassigned?.addEventListener("dragover", (event) => {
     if (!seatMapState.editMode) return;
@@ -1922,6 +2073,17 @@ Object.values(seatMapDom).forEach((dom) => {
     if (!fitButton) return;
     fitDxfSeatMapBoard();
   });
+  dom.board?.addEventListener("click", (event) => {
+    const memberCard = event.target.closest(".seatmap-member-card[data-member-id]");
+    if (memberCard) {
+      renderSeatMapMemberContext(Number(memberCard.dataset.memberId));
+      return;
+    }
+    const cell = event.target.closest(".seatmap-cell[data-row][data-col]");
+    if (!cell) return;
+    const placement = getCellPlacementMap().get(`${Number(cell.dataset.row)}:${Number(cell.dataset.col)}`);
+    renderSeatMapMemberContext(placement ? Number(placement.member_id) : null);
+  });
   dom.board?.addEventListener("dragover", (event) => {
     if (!seatMapState.editMode) return;
     const target = isSlotBasedSeatMap()
diff --git a/frontend/public/index.html b/frontend/public/index.html
index 370eed6..b395b65 100644
--- a/frontend/public/index.html
+++ b/frontend/public/index.html
@@ -181,6 +181,7 @@
                   <span class="hidden">구성원 검색</span>
                   <input id="seatmap-admin-search" type="search" placeholder="이름 또는 부서 검색">
                 </label>
+                <div id="seatmap-admin-context" class="seatmap-context-panel hidden"></div>
                 <div id="seatmap-admin-unassigned" class="seatmap-member-list"></div>
               </section>
             </aside>
@@ -220,6 +221,7 @@
                   <span class="hidden">구성원 검색</span>
                   <input id="seatmap-readonly-search" type="search" placeholder="이름 또는 부서 검색">
                 </label>
+                <div id="seatmap-readonly-context" class="seatmap-context-panel hidden"></div>
                 <div id="seatmap-readonly-unassigned" class="seatmap-member-list"></div>
               </section>
             </aside>
diff --git a/frontend/public/styles.css b/frontend/public/styles.css
index 6003b4e..63bb78d 100644
--- a/frontend/public/styles.css
+++ b/frontend/public/styles.css
@@ -913,6 +913,39 @@ body {
   padding: var(--seatmap-gap);
 }
 
+.seatmap-team-overlay {
+  pointer-events: none;
+  align-self: stretch;
+  justify-self: stretch;
+  border-radius: 20px;
+  border: 2px solid color-mix(in srgb, var(--seatmap-team-accent, rgba(13, 148, 136, 0.3)) 62%, white);
+  background: linear-gradient(
+    180deg,
+    color-mix(in srgb, var(--seatmap-team-soft, rgba(13, 148, 136, 0.12)) 100%, transparent),
+    color-mix(in srgb, var(--seatmap-team-soft, rgba(13, 148, 136, 0.08)) 90%, transparent)
+  );
+  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.22), 0 8px 18px rgba(16, 37, 29, 0.08);
+  margin: 4px;
+  z-index: 0;
+}
+
+.seatmap-team-overlay::before {
+  content: attr(data-team-label);
+  position: absolute;
+  top: 10px;
+  left: 12px;
+  display: inline-flex;
+  align-items: center;
+  min-height: 26px;
+  padding: 0 11px;
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--seatmap-team-soft, rgba(13, 148, 136, 0.14)) 84%, white);
+  color: color-mix(in srgb, var(--seatmap-team-accent, #0f766e) 86%, #10251d);
+  font-size: 11px;
+  font-weight: 900;
+  letter-spacing: 0.02em;
+}
+
 .seatmap-cell {
   position: relative;
   min-width: 0;
@@ -920,6 +953,7 @@ body {
   border: 1px dashed rgba(15, 23, 42, 0.14);
   background: rgba(255, 255, 255, 0.12);
   transition: border-color 0.18s ease, background 0.18s ease;
+  z-index: 1;
 }
 
 .seatmap-cell.editable:hover {
@@ -931,6 +965,13 @@ body {
   background: rgba(255, 255, 255, 0.18);
 }
 
+.seatmap-cell.occupied.team-colored {
+  border-color: color-mix(in srgb, var(--seatmap-team-accent, rgba(15, 118, 110, 0.72)) 62%, white);
+  background:
+    linear-gradient(180deg, color-mix(in srgb, var(--seatmap-team-soft, rgba(15, 118, 110, 0.14)) 86%, transparent), rgba(255, 255, 255, 0.14)),
+    rgba(255, 255, 255, 0.18);
+}
+
 .seatmap-cell-label {
   position: absolute;
   top: 4px;
@@ -959,6 +1000,12 @@ body {
   overflow: hidden;
 }
 
+.seatmap-member-card.team-colored {
+  border-color: color-mix(in srgb, var(--seatmap-team-accent, rgba(245, 158, 11, 0.95)) 42%, rgba(255,255,255,0.4));
+  background:
+    linear-gradient(180deg, color-mix(in srgb, var(--seatmap-team-soft, rgba(245, 158, 11, 0.18)) 68%, rgba(15, 23, 42, 0.84)) 0%, rgba(15, 23, 42, 0.84) 100%);
+}
+
 .seatmap-member-card.draggable {
   cursor: grab;
 }
@@ -1008,11 +1055,26 @@ body {
 }
 
 .seatmap-member-text em {
-  color: rgba(226, 232, 240, 0.84);
+  color: rgba(255, 247, 237, 0.96);
   font-size: 10px;
+  font-weight: 800;
   font-style: normal;
 }
 
+.seatmap-team-chip {
+  display: inline-flex;
+  align-items: center;
+  max-width: 100%;
+  padding: 2px 6px;
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--seatmap-team-soft, rgba(245, 158, 11, 0.18)) 88%, white);
+  color: color-mix(in srgb, var(--seatmap-team-accent, #b45309) 85%, #10251d);
+  font-size: 10px;
+  font-weight: 900;
+  line-height: 1;
+  letter-spacing: 0.01em;
+}
+
 .seatmap-sidebar {
   height: 100%;
   min-height: 0;
@@ -1195,6 +1257,11 @@ body {
   text-align: left;
 }
 
+.seatmap-member-search-card.team-colored {
+  border-color: color-mix(in srgb, var(--seatmap-team-accent, rgba(245, 158, 11, 0.24)) 34%, rgba(226, 232, 240, 0.9));
+  background: linear-gradient(180deg, color-mix(in srgb, var(--seatmap-team-soft, rgba(245, 158, 11, 0.1)) 78%, white), #fff);
+}
+
 .seatmap-member-badge {
   flex: 0 0 auto;
   display: inline-flex;
@@ -1219,8 +1286,8 @@ body {
   min-height: 42px;
   padding: 10px 12px;
   border-radius: 12px;
-  background: #3f4658;
-  border: 1px solid rgba(148, 163, 184, 0.14);
+  background: transparent;
+  border: 1px solid rgba(194, 170, 134, 0.34);
   box-shadow: none;
 }
 
@@ -1232,12 +1299,14 @@ body {
 
 .seatmap-member-text-inline strong {
   font-size: 13px;
+  color: #10251d;
 }
 
 .seatmap-member-text-inline em {
   display: inline;
-  color: rgba(226, 232, 240, 0.8);
+  color: #6f5b3e;
   font-size: 11px;
+  font-weight: 800;
 }
 
 .seatmap-slot .seatmap-member-card {
@@ -1266,6 +1335,81 @@ body {
   display: none;
 }
 
+.seatmap-context-panel {
+  display: grid;
+  gap: 10px;
+  padding: 14px;
+  border: 1px solid rgba(194, 170, 134, 0.28);
+  border-radius: 18px;
+  background: linear-gradient(180deg, rgba(255, 252, 247, 0.96), rgba(246, 239, 227, 0.92));
+  box-shadow: 0 14px 28px rgba(16, 37, 29, 0.08);
+}
+
+.seatmap-context-panel.hidden {
+  display: none;
+}
+
+.seatmap-context-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 10px;
+}
+
+.seatmap-context-title {
+  display: grid;
+  gap: 4px;
+}
+
+.seatmap-context-title strong {
+  color: #10251d;
+  font-size: 14px;
+  font-weight: 900;
+}
+
+.seatmap-context-title span {
+  color: #6b7280;
+  font-size: 11px;
+  font-weight: 700;
+}
+
+.seatmap-context-badge {
+  display: inline-flex;
+  align-items: center;
+  min-height: 28px;
+  padding: 0 10px;
+  border-radius: 999px;
+  background: color-mix(in srgb, var(--seatmap-team-soft, rgba(245, 158, 11, 0.14)) 88%, white);
+  color: color-mix(in srgb, var(--seatmap-team-accent, #b45309) 84%, #10251d);
+  font-size: 11px;
+  font-weight: 900;
+}
+
+.seatmap-context-tree {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.seatmap-context-node {
+  display: inline-flex;
+  align-items: center;
+  min-height: 30px;
+  padding: 0 11px;
+  border-radius: 999px;
+  background: rgba(255, 255, 255, 0.84);
+  border: 1px solid rgba(194, 170, 134, 0.28);
+  color: #30423a;
+  font-size: 11px;
+  font-weight: 800;
+}
+
+.seatmap-context-empty {
+  color: #7b7b6c;
+  font-size: 12px;
+  line-height: 1.5;
+}
+
 .seatmap-dxf-stage {
   cursor: grab;
 }
diff --git a/scripts/check_8081_smoke.sh b/scripts/check_8081_smoke.sh
new file mode 100644
index 0000000..56d8510
--- /dev/null
+++ b/scripts/check_8081_smoke.sh
@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT_DIR"
+
+echo "[smoke] checking dev containers"
+docker ps --format '{{.Names}}' | grep -qx 'mh-dashboard-organization-dev-backend-1'
+docker ps --format '{{.Names}}' | grep -qx 'mh-dashboard-organization-dev-proxy-1'
+
+echo "[smoke] running 8081 endpoint checks"
+docker exec mh-dashboard-organization-dev-backend-1 python - <<'PY'
+import sys
+import urllib.request
+
+
+checks = [
+    ("health", "http://127.0.0.1:8000/api/health", b'"status"'),
+    ("db-status-api", "http://127.0.0.1:8000/api/admin/db-status", b'"tables"'),
+    ("ledger-default-api", "http://127.0.0.1:8000/api/integration/business-ledger-default", b'PK'),
+    ("legacy-organization", "http://127.0.0.1:8000/legacy/organization", b'organization'),
+    ("payment", "http://127.0.0.1:8000/integrations/payment", b'const App = () =>'),
+    ("ledger", "http://127.0.0.1:8000/integrations/ledger", b'xlsx.full.min.js'),
+    ("mh", "http://127.0.0.1:8000/integrations/mh", b'const App = () =>'),
+    ("proxy-root", "http://proxy/", b'app.js'),
+    ("proxy-db-status", "http://proxy/db-status.html", b'전체 테이블 현황'),
+]
+
+failed = []
+
+for name, url, needle in checks:
+    try:
+        with urllib.request.urlopen(url, timeout=8) as response:
+            body = response.read()
+            status = getattr(response, "status", response.getcode())
+            if status != 200:
+                failed.append(f"{name}: unexpected status {status}")
+                continue
+            if needle not in body:
+                failed.append(f"{name}: missing expected marker {needle!r}")
+                continue
+            print(f"[ok] {name} -> {status}")
+    except Exception as exc:
+        failed.append(f"{name}: {exc}")
+
+if failed:
+    print("[smoke] failures detected:")
+    for item in failed:
+        print(f" - {item}")
+    sys.exit(1)
+
+print("[smoke] all checks passed")
+PY