diff --git a/adminfront/src/features/users/UserDetailPage.tsx b/adminfront/src/features/users/UserDetailPage.tsx
index edfc2d03..9b91229d 100644
--- a/adminfront/src/features/users/UserDetailPage.tsx
+++ b/adminfront/src/features/users/UserDetailPage.tsx
@@ -391,7 +391,12 @@ function UserDetailPage() {
         phone: user.phone || "",
         role: user.role,
         status: user.status,
-        tenantSlug: user.tenantSlug || "",
+        tenantSlug:
+          user.companyCode ||
+          user.joinedTenants?.find(
+            (t) => t.type === "COMPANY" || t.type === "COMPANY_GROUP",
+          )?.slug ||
+          "",
         department: user.department || "",
         position: user.position || "",
         jobTitle: user.jobTitle || "",
@@ -459,6 +464,16 @@ function UserDetailPage() {
     }
   };
 
+  const userAffiliatedTenants = React.useMemo(() => {
+    const joined = user?.joinedTenants || [];
+    const primary = user?.tenant;
+    const all = [...joined];
+    if (primary && !joined.some((t) => t.id === primary.id)) {
+      all.unshift(primary);
+    }
+    return all;
+  }, [user?.joinedTenants, user?.tenant]);
+
   if (isLoading) {
     return (
       <div className="flex h-64 items-center justify-center">
@@ -484,9 +499,6 @@ function UserDetailPage() {
     );
   }
 
-  const userAffiliatedTenants =
-    user.joinedTenants || (user.tenant ? [user.tenant] : []);
-
   return (
     <div className="space-y-6">
       {/* Header with back button and actions */}
@@ -525,7 +537,10 @@ function UserDetailPage() {
               >
                 <Building2 size={12} className="mr-1.5" />
                 {user.tenant?.name ||
-                  user.tenantSlug ||
+                  user.companyCode ||
+                  user.joinedTenants?.find(
+                    (t) => t.type === "COMPANY" || t.type === "COMPANY_GROUP",
+                  )?.name ||
                   t("ui.admin.users.detail.form.tenant_global", "시스템 전역")}
               </Badge>
               <Badge