diff --git a/backend/app/main.py b/backend/app/main.py
index da4b922..33b3ae0 100755
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1020,13 +1020,205 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
         f"const STORAGE_KEY = null;\n    const placed = new Set({placed_literal});",
         1,
     )
+    html = html.replace(
+        """        ctx.strokeStyle = selected
+          ? "rgba(220, 38, 38, 0.98)"
+          : active
+            ? "rgba(15, 118, 110, 0.98)"
+            : chair.kind === "group"
+              ? "rgba(16, 134, 149, 0.74)"
+              : "rgba(21, 149, 142, 0.8)";
+        ctx.lineWidth = (selected ? 2.6 : active ? 2.1 : baseWidth) / camera.scale;""",
+        """        ctx.strokeStyle = selected
+          ? "rgba(220, 38, 38, 0.98)"
+          : "rgba(15, 118, 110, 0.88)";
+        ctx.lineWidth = (selected ? 2.6 : active ? 2.0 : 1.6) / camera.scale;""",
+        1,
+    )
     html = html.replace(
         "function persistPlaced() {\n      localStorage.setItem(STORAGE_KEY, JSON.stringify([...placed]));\n    }",
         "function persistPlaced() {\n      return;\n    }",
         1,
     )
+    html = html.replace(
+        """    window.addEventListener("pointerup", (event) => {
+      if (dragging && dragStart) {
+        const move = Math.hypot(event.clientX - dragStart.x, event.clientY - dragStart.y);
+        if (move < 4) {
+          const rect = canvas.getBoundingClientRect();
+          const picked = pickChair(event.clientX - rect.left, event.clientY - rect.top);
+          if (picked) {
+            if (placed.has(picked.key)) placed.delete(picked.key);
+            else placed.add(picked.key);
+            persistPlaced();
+          }
+        }
+      }
+      dragging = false;
+      dragStart = null;
+      canvas.classList.remove("dragging");
+      requestDraw();
+    });""",
+        """    window.addEventListener("pointerup", () => {
+      dragging = false;
+      dragStart = null;
+      canvas.classList.remove("dragging");
+      requestDraw();
+    });""",
+        1,
+    )
+    html = html.replace(
+        """    document.getElementById("clear-btn").addEventListener("click", () => {
+      placed.clear();
+      persistPlaced();
+      requestDraw();
+    });""",
+        """    document.getElementById("clear-btn").addEventListener("click", () => {
+      requestDraw();
+    });""",
+        1,
+    )
     bridge_script = """
+  <style>
+    #clear-btn { display: none !important; }
+    .seat-popup {
+      position: absolute;
+      min-width: 190px;
+      padding: 12px 14px;
+      border-radius: 16px;
+      background: rgba(17,24,39,0.96);
+      color: white;
+      box-shadow: 0 18px 36px rgba(15,23,42,0.22);
+      z-index: 4;
+    }
+    .seat-popup[hidden] { display: none; }
+    .seat-popup strong { display: block; margin-bottom: 6px; font-size: 14px; }
+    .seat-popup div { font-size: 12px; line-height: 1.45; color: rgba(255,255,255,0.82); }
+    .seat-popup button {
+      margin-top: 10px;
+      width: 100%;
+      border: none;
+      border-radius: 12px;
+      padding: 8px 10px;
+      font: inherit;
+      font-weight: 700;
+      cursor: pointer;
+      color: white;
+      background: rgba(220, 38, 38, 0.98);
+    }
+  </style>
   <script>
+    const seatAssignments = new Map();
+    let selectedChairKey = null;
+    let viewerMode = "default";
+    const popup = document.createElement("div");
+    popup.className = "seat-popup";
+    popup.hidden = true;
+    document.querySelector(".viewer").appendChild(popup);
+
+    function getAssignment(key) {
+      return seatAssignments.get(String(key)) || null;
+    }
+
+    function hideSeatPopup() {
+      popup.hidden = true;
+      popup.innerHTML = "";
+    }
+
+    function setViewerMode(mode) {
+      viewerMode = mode === "compact" ? "compact" : "default";
+      const head = document.querySelector(".viewer-head");
+      const actions = document.querySelector(".viewer-actions");
+      if (head) head.style.display = viewerMode === "compact" ? "none" : "";
+      if (actions) actions.style.display = viewerMode === "compact" ? "none" : "";
+      if (viewerMode === "compact") {
+        hideSeatPopup();
+        selectedChairKey = null;
+      }
+    }
+
+    function showSeatPopup(chairKey, x, y) {
+      const assignment = getAssignment(chairKey);
+      if (!assignment) {
+        hideSeatPopup();
+        return;
+      }
+      popup.innerHTML = `
+        <strong>${assignment.name}</strong>
+        <div>직급: ${assignment.rank || "-"}</div>
+        <div>상태: 배치완료</div>
+        <button type="button" data-seatmap-delete="${chairKey}">자리 비우기</button>
+      `;
+      popup.style.left = `${x + 18}px`;
+      popup.style.top = `${y + 18}px`;
+      popup.hidden = false;
+    }
+
+    function focusChair(chairKey, padding = 2200) {
+      const chair = chairGeometry.find((item) => String(item.key) === String(chairKey));
+      if (!chair) return;
+      const rect = canvas.getBoundingClientRect();
+      const pad = 24;
+      const minX = chair.minX - padding;
+      const maxX = chair.maxX + padding;
+      const minY = chair.minY - padding;
+      const maxY = chair.maxY + padding;
+      const width = Math.max(1, maxX - minX);
+      const height = Math.max(1, maxY - minY);
+      camera.scale = Math.max(0.002, Math.min(2, Math.min((rect.width - pad * 2) / width, (rect.height - pad * 2) / height)));
+      camera.offsetX = pad - minX * camera.scale + (rect.width - pad * 2 - width * camera.scale) / 2;
+      camera.offsetY = pad - (world.maxY - maxY + world.minY) * camera.scale + (rect.height - pad * 2 - height * camera.scale) / 2;
+      requestDraw();
+    }
+
+    function setAssignments(items) {
+      seatAssignments.clear();
+      placed.clear();
+      (items || []).forEach((item) => {
+        const key = String(item.key || "");
+        if (!key) return;
+        const assignment = {
+          key,
+          name: item.name || "-",
+          rank: item.rank || "-",
+          memberId: Number(item.member_id || 0),
+        };
+        seatAssignments.set(key, assignment);
+        placed.add(key);
+      });
+      if (selectedChairKey && !seatAssignments.has(selectedChairKey)) {
+        selectedChairKey = null;
+        hideSeatPopup();
+      }
+      if (typeof requestDraw === "function") requestDraw();
+    }
+
+    renderTooltip = function renderTooltipOverride() {
+      if (!hovered) {
+        tooltip.classList.remove("visible");
+        hoverChip.textContent = "chair hover: none";
+        return;
+      }
+      const assignment = getAssignment(hovered.key);
+      hoverChip.textContent = assignment
+        ? `chair hover: ${assignment.name}`
+        : "chair hover: 공석";
+      tooltip.innerHTML = assignment
+        ? `
+          <strong>${assignment.name}</strong>
+          <div>직급: ${assignment.rank || "-"}</div>
+          <div>상태: 배치완료</div>
+        `
+        : `
+          <strong>공석</strong>
+          <div>좌석: ${hovered.key}</div>
+          <div>상태: 미배치</div>
+        `;
+      tooltip.style.left = `${pointer.x + 14}px`;
+      tooltip.style.top = `${pointer.y + 14}px`;
+      tooltip.classList.add("visible");
+    };
+
     window.__mhSeatmap = {
       getCanvas() { return document.getElementById("canvas"); },
       pickChairAt(x, y) { return typeof pickChair === "function" ? pickChair(x, y) : null; },
@@ -1034,14 +1226,60 @@ def build_center_chair_viewer_html(layout: dict[str, object]) -> str:
         placed.clear();
         (keys || []).forEach((key) => placed.add(String(key)));
         if (typeof requestDraw === "function") requestDraw();
-      }
+      },
+      setAssignments,
+      focusChair,
+      setViewerMode,
     };
+
+    canvas.addEventListener("click", (event) => {
+      if (viewerMode === "compact") return;
+      const rect = canvas.getBoundingClientRect();
+      const picked = window.__mhSeatmap.pickChairAt(
+        event.clientX - rect.left,
+        event.clientY - rect.top,
+      );
+      if (!picked) {
+        selectedChairKey = null;
+        hideSeatPopup();
+        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 (typeof requestDraw === "function") requestDraw();
+    });
+
+    popup.addEventListener("click", (event) => {
+      const button = event.target.closest("[data-seatmap-delete]");
+      if (!button) return;
+      const slotKey = String(button.dataset.seatmapDelete || "");
+      if (!slotKey) return;
+      selectedChairKey = null;
+      hideSeatPopup();
+      window.parent.postMessage({ type: "seatmap-clear-slot", key: slotKey }, window.location.origin);
+    });
+
+    canvas.addEventListener("contextmenu", (event) => {
+      event.preventDefault();
+    });
+
     window.addEventListener("message", (event) => {
       const data = event.data;
       if (!data || typeof data !== "object") return;
       if (data.type === "seatmap-set-placed") {
         window.__mhSeatmap.setPlaced(Array.isArray(data.keys) ? data.keys : []);
       }
+      if (data.type === "seatmap-set-assignments") {
+        window.__mhSeatmap.setAssignments(Array.isArray(data.items) ? data.items : []);
+      }
+      if (data.type === "seatmap-focus-chair") {
+        window.__mhSeatmap.focusChair(String(data.key || ""), Number(data.padding || 2200));
+      }
+      if (data.type === "seatmap-set-mode") {
+        window.__mhSeatmap.setViewerMode(String(data.mode || "default"));
+      }
     });
   </script>
 """
diff --git a/frontend/public/app.js b/frontend/public/app.js
index bac8944..2785030 100644
--- a/frontend/public/app.js
+++ b/frontend/public/app.js
@@ -103,6 +103,10 @@ function isAdmin() {
   return getSession()?.user?.role === "admin";
 }
 
+function isSlotBasedSeatMap() {
+  return seatMapState.seatMap?.source_type === "dxf" || seatMapState.seatMap?.source_type === "fixed_html";
+}
+
 function escapeHtml(value) {
   return String(value ?? "")
     .replaceAll("&", "&amp;")
@@ -618,6 +622,24 @@ function getDraftPlacedSlotKeys() {
     .map((value) => String(value));
 }
 
+function getSeatAssignmentPayload() {
+  const slotMap = getSeatSlotMap();
+  const memberMap = getMemberMap();
+  return getPlacementSource()
+    .map((placement) => {
+      const slot = slotMap.get(Number(placement.seat_slot_id));
+      const member = memberMap.get(Number(placement.member_id));
+      if (!slot || !member) return null;
+      return {
+        key: String(slot.slot_key),
+        member_id: Number(member.id),
+        name: member.name || "-",
+        rank: member.rank || "-",
+      };
+    })
+    .filter(Boolean);
+}
+
 function syncSeatMapViewerFrame() {
   const frame = seatMapBoard?.querySelector("#seatmap-dxf-frame");
   if (!frame?.contentWindow) return;
@@ -625,6 +647,22 @@ function syncSeatMapViewerFrame() {
     { type: "seatmap-set-placed", keys: getDraftPlacedSlotKeys() },
     window.location.origin,
   );
+  frame.contentWindow.postMessage(
+    { type: "seatmap-set-assignments", items: getSeatAssignmentPayload() },
+    window.location.origin,
+  );
+}
+
+function updateSeatMapDraftUi() {
+  if (seatMapSaveBtn) {
+    seatMapSaveBtn.hidden = !isAdmin() || !seatMapState.seatMap;
+    seatMapSaveBtn.disabled = !seatMapState.dirty;
+  }
+  if (seatMapCancelBtn) {
+    seatMapCancelBtn.hidden = !seatMapState.seatMap;
+  }
+  renderUnassignedMembers();
+  syncSeatMapViewerFrame();
 }
 
 function setupSeatMapViewerFrame() {
@@ -657,7 +695,7 @@ function setupSeatMapViewerFrame() {
       const matchedSlot = (seatMapState.slots || []).find((item) => String(item.slot_key) === String(picked.key));
       if (!matchedSlot) return;
       upsertDraftPlacementForSlot(memberId, Number(matchedSlot.id));
-      renderSeatMap();
+      updateSeatMapDraftUi();
     });
   }, { once: true });
 }
@@ -767,6 +805,13 @@ function handleEmbeddedNavigationMessage(event) {
     hideUserPopover();
     setActiveView("organization");
   }
+  if (data.type === "seatmap-clear-slot" && isAdmin()) {
+    const cleared = clearDraftPlacementBySlotKey(String(data.key || ""));
+    if (cleared) {
+      setSeatMapStatus("구성원을 공석으로 이동했습니다. 저장 버튼으로 반영하세요.", "info");
+      updateSeatMapDraftUi();
+    }
+  }
 }
 
 async function fetchJson(url, options) {
@@ -848,6 +893,15 @@ async function getImageDimensions(file) {
   });
 }
 
+function clearDraftPlacementBySlotKey(slotKey) {
+  const matchedSlot = (seatMapState.slots || []).find((item) => String(item.slot_key) === String(slotKey));
+  if (!matchedSlot) return false;
+  const placement = (seatMapState.draftPlacements || []).find((item) => Number(item.seat_slot_id) === Number(matchedSlot.id));
+  if (!placement) return false;
+  removeDraftPlacement(Number(placement.member_id));
+  return true;
+}
+
 async function uploadSeatMapImage(file, name) {
   const formData = new FormData();
   formData.append("file", file);
@@ -927,7 +981,7 @@ function handleSeatMapCellDrop(event) {
   event.preventDefault();
   const memberId = getDraggedMemberId(event);
   if (!memberId) return;
-  if (seatMapState.seatMap?.source_type === "dxf") {
+  if (isSlotBasedSeatMap()) {
     const slot = event.target.closest(".seatmap-slot");
     if (slot) {
       upsertDraftPlacementForSlot(memberId, Number(slot.dataset.slotId));
@@ -957,7 +1011,7 @@ function handleSeatMapListDrop(event) {
   const memberId = getDraggedMemberId(event);
   if (!memberId) return;
   removeDraftPlacement(memberId);
-  renderSeatMap();
+  updateSeatMapDraftUi();
 }
 
 function setActiveView(view) {
@@ -1108,7 +1162,7 @@ if (seatMapFormImage) {
 
 if (seatMapBoard) {
   seatMapBoard.addEventListener("wheel", (event) => {
-    if (seatMapState.seatMap?.source_type !== "dxf") return;
+    if (!isSlotBasedSeatMap()) return;
     event.preventDefault();
     zoomDxfSeatMapAtPoint(event.clientX, event.clientY, event.deltaY < 0 ? 1.08 : 0.92);
   }, { passive: false });
@@ -1119,7 +1173,7 @@ if (seatMapBoard) {
   });
   seatMapBoard.addEventListener("dragover", (event) => {
     if (!seatMapState.editMode) return;
-    const target = seatMapState.seatMap?.source_type === "dxf"
+    const target = isSlotBasedSeatMap()
       ? (event.target.closest(".seatmap-slot") || event.target.closest("#seatmap-dxf-canvas"))
       : event.target.closest(".seatmap-cell");
     if (!target) return;
@@ -1131,7 +1185,7 @@ if (seatMapBoard) {
 
 if (seatMapBoardWrap) {
   seatMapBoardWrap.addEventListener("mousedown", (event) => {
-    if (seatMapState.seatMap?.source_type !== "dxf") return;
+    if (!isSlotBasedSeatMap()) return;
     if (seatMapBoard?.querySelector("#seatmap-dxf-canvas")) return;
     if (event.button !== 0) return;
     if (event.target.closest(".seatmap-member-card, button, input, label")) return;
@@ -1150,7 +1204,7 @@ if (seatMapBoardWrap) {
     updateSeatMapViewerHoverChip();
   });
   seatMapBoardWrap.addEventListener("mousemove", (event) => {
-    if (seatMapState.seatMap?.source_type !== "dxf") return;
+    if (!isSlotBasedSeatMap()) return;
     if (seatMapBoard?.querySelector("#seatmap-dxf-canvas")) return;
     const slot = event.target.closest(".seatmap-slot");
     const nextSlotId = slot ? Number(slot.dataset.slotId) : null;
@@ -1207,7 +1261,7 @@ setActiveView(currentView);
 renderAuth();
 
 window.addEventListener("resize", () => {
-  if (seatMapState.seatMap?.source_type !== "dxf" || currentView !== "seatmap") return;
+  if (!isSlotBasedSeatMap() || currentView !== "seatmap") return;
   requestAnimationFrame(() => {
     if (seatMapState.zoom === 1) {
       centerSeatMapBoard();
diff --git a/legacy/static/organization.css b/legacy/static/organization.css
index 0d2b9bb..5e0661d 100644
--- a/legacy/static/organization.css
+++ b/legacy/static/organization.css
@@ -541,6 +541,14 @@ body {
   overflow: hidden;
 }
 
+.seat-preview-frame {
+  display: block;
+  width: 100%;
+  height: 300px;
+  border: 0;
+  background: #fff;
+}
+
 .seat-preview-placeholder {
   display: flex;
   flex-direction: column;
@@ -551,6 +559,7 @@ body {
   font-weight: 900;
 }
 
+
 .seat-preview-placeholder-icon {
   width: 52px;
   height: 52px;
diff --git a/legacy/static/organization.js b/legacy/static/organization.js
index bea9228..1d8ee80 100644
--- a/legacy/static/organization.js
+++ b/legacy/static/organization.js
@@ -6,6 +6,7 @@ let collapsedUnits = new Set();
 let isListMode = false;
 let emptyStateMessage = '서버에 조직 데이터가 없습니다. 상단의 업로드 버튼으로 초기 데이터를 넣어주세요.';
 let photoPreviewObjectUrl = null;
+let seatMapLayoutCache = null;
 
 const levelOrder = ['부서', '그룹', '디비전', '팀', '셀'];
 const dropdownFields = ['소속회사', '직급', '직책', ...levelOrder];
@@ -146,6 +147,44 @@ async function loadMembers(message) {
   render();
 }
 
+async function loadActiveSeatMapLayout(force = false) {
+  if (seatMapLayoutCache && !force) {
+    return seatMapLayoutCache;
+  }
+  try {
+    const activePayload = await apiFetch('/api/seat-maps/active');
+    const seatMap = activePayload?.item;
+    if (!seatMap?.id) {
+      seatMapLayoutCache = null;
+      return null;
+    }
+    const layoutPayload = await apiFetch(`/api/seat-maps/${seatMap.id}/layout`);
+    seatMapLayoutCache = layoutPayload;
+    return layoutPayload;
+  } catch {
+    seatMapLayoutCache = null;
+    return null;
+  }
+}
+
+function getMemberSeatInfo(layout, memberId) {
+  if (!layout || !memberId) {
+    return null;
+  }
+  const placement = (layout.placements || []).find((item) => Number(item.member_id) === Number(memberId));
+  if (!placement) {
+    return null;
+  }
+  const slot = (layout.slots || []).find((item) => Number(item.id) === Number(placement.seat_slot_id));
+  return {
+    seatMapId: layout.seat_map?.id || null,
+    seatMapName: layout.seat_map?.name || '자리배치도',
+    seatLabel: placement.seat_label || slot?.label || '',
+    slotKey: slot?.slot_key || '',
+    assigned: true,
+  };
+}
+
 async function syncMembers(nextMembers) {
   const payload = await apiFetch('/api/members/bulk-sync', {
     method: 'PUT',
@@ -846,31 +885,86 @@ function handlePhotoFileChange(event) {
   updatePhotoPreview(photoPreviewObjectUrl, name);
 }
 
-function renderSeatPreviewCard(seatLabel) {
-  const safeLabel = escapeHtml(seatLabel || '');
-  const badge = safeLabel
-    ? `<span class="seat-preview-badge">${safeLabel}</span>`
+function renderSeatPreviewCard(seatInfo) {
+  const assigned = Boolean(seatInfo?.assigned);
+  const safeLabel = escapeHtml(seatInfo?.seatLabel || '');
+  const safeSeatMapName = escapeHtml(seatInfo?.seatMapName || '자리배치도');
+  const safeSlotKey = escapeHtml(seatInfo?.slotKey || '');
+  const badge = assigned
+    ? `<span class="seat-preview-badge">${safeLabel || '배치완료'}</span>`
     : '<span class="seat-preview-badge seat-preview-badge-muted">미배치</span>';
+  const body = assigned
+    ? `
+      <iframe
+        id="member-seat-preview-frame"
+        class="seat-preview-frame"
+        src="/api/seat-maps/${Number(seatInfo.seatMapId || 0)}/viewer"
+        title="${safeSeatMapName} 좌석 미리보기"
+        loading="eager"
+        referrerpolicy="same-origin"
+      ></iframe>
+    `
+    : `
+      <div class="seat-preview-placeholder">
+        <span class="seat-preview-placeholder-icon">⌖</span>
+        <span>현재 공석 또는 미배치 상태입니다.</span>
+      </div>
+    `;
 
   return `
     <div class="seat-preview-card">
       <div class="seat-preview-head">
         <div>
           <strong>재석위치</strong>
-          <p>향후 해당 인원의 좌석 영역을 크롭해 표시하고, 스크롤 확대/축소를 지원할 예정입니다.</p>
+          <p>${assigned ? '현재 자리배치도 기준으로 배치된 좌석 정보를 표시합니다.' : '현재 자리배치도에서 배치된 좌석이 없습니다.'}</p>
         </div>
         ${badge}
       </div>
       <div class="seat-preview-canvas">
-        <div class="seat-preview-placeholder">
-          <span class="seat-preview-placeholder-icon">⌖</span>
-          <span>좌석 이미지 연동 예정</span>
-        </div>
+        ${body}
       </div>
     </div>
   `;
 }
 
+async function hydrateMemberSeatPreview(member) {
+  const target = document.getElementById('member-seat-preview');
+  if (!target) {
+    return;
+  }
+  target.innerHTML = renderSeatPreviewCard({
+    assigned: false,
+    seatMapName: '자리배치도',
+    seatLabel: member['자리위치'] || '',
+    slotKey: '',
+  });
+  const layout = await loadActiveSeatMapLayout(true);
+  if (!document.getElementById('member-seat-preview')) {
+    return;
+  }
+  const seatInfo = getMemberSeatInfo(layout, member.id) || {
+    seatMapName: layout?.seat_map?.name || '자리배치도',
+    seatLabel: member['자리위치'] || '',
+    slotKey: '',
+    assigned: Boolean(member['자리위치']),
+  };
+  target.innerHTML = renderSeatPreviewCard(seatInfo);
+  if (!seatInfo.assigned || !seatInfo.seatMapId || !seatInfo.slotKey) {
+    return;
+  }
+  const frame = document.getElementById('member-seat-preview-frame');
+  if (!frame) {
+    return;
+  }
+  frame.addEventListener('load', () => {
+    if (!frame.contentWindow) {
+      return;
+    }
+    frame.contentWindow.postMessage({ type: 'seatmap-set-mode', mode: 'compact' }, window.location.origin);
+    frame.contentWindow.postMessage({ type: 'seatmap-focus-chair', key: seatInfo.slotKey, padding: 2600 }, window.location.origin);
+  }, { once: true });
+}
+
 function switchModalTab(tab) {
   const isBasic = tab === 'basic';
   document.getElementById('modal-sec-basic').classList.toggle('hidden', !isBasic);
@@ -919,11 +1013,12 @@ function openModal(id) {
         </div>
       </div>
       <div class="w-full mt-2">
-        ${renderSeatPreviewCard(member['자리위치'] || '')}
+        <div id="member-seat-preview">${renderSeatPreviewCard({ assigned: false, seatLabel: member['자리위치'] || '', seatMapName: '자리배치도', slotKey: '' })}</div>
       </div>
     `;
     footer.innerHTML = '<button onclick="closeModal()" class="w-full bg-slate-800 text-white py-4 rounded-xl font-bold text-sm shadow-lg">닫기</button>';
     modal.style.display = 'flex';
+    hydrateMemberSeatPreview(member);
     return;
   }