diff --git a/frontend/components/pop/management/PopCategoryTree.tsx b/frontend/components/pop/management/PopCategoryTree.tsx
index 705d7163..37e4f0ba 100644
--- a/frontend/components/pop/management/PopCategoryTree.tsx
+++ b/frontend/components/pop/management/PopCategoryTree.tsx
@@ -471,7 +471,15 @@ export function PopCategoryTree({
   // 상태 관리
   const [groups, setGroups] = useState<PopScreenGroup[]>([]);
   const [loading, setLoading] = useState(true);
-  const [expandedGroups, setExpandedGroups] = useState<Set<number>>(new Set());
+  const [expandedGroups, setExpandedGroups] = useState<Set<number>>(() => {
+    if (typeof window === "undefined") return new Set();
+    try {
+      const saved = sessionStorage.getItem("pop-tree-expanded-groups");
+      return saved ? new Set(JSON.parse(saved) as number[]) : new Set();
+    } catch {
+      return new Set();
+    }
+  });
   const [selectedGroupId, setSelectedGroupId] = useState<number | null>(null);
 
   // 그룹 모달 상태
@@ -500,7 +508,15 @@ export function PopCategoryTree({
   const [moveSearchTerm, setMoveSearchTerm] = useState("");
 
   // 미분류 회사코드별 접기/펼치기
-  const [expandedCompanyCodes, setExpandedCompanyCodes] = useState<Set<string>>(new Set());
+  const [expandedCompanyCodes, setExpandedCompanyCodes] = useState<Set<string>>(() => {
+    if (typeof window === "undefined") return new Set();
+    try {
+      const saved = sessionStorage.getItem("pop-tree-expanded-companies");
+      return saved ? new Set(JSON.parse(saved) as string[]) : new Set();
+    } catch {
+      return new Set();
+    }
+  });
 
   // 화면 맵 생성 (screen_id로 빠르게 조회)
   const screensMap = useMemo(() => {
@@ -544,6 +560,9 @@ export function PopCategoryTree({
       } else {
         next.add(groupId);
       }
+      try {
+        sessionStorage.setItem("pop-tree-expanded-groups", JSON.stringify([...next]));
+      } catch { /* noop */ }
       return next;
     });
   };
@@ -1013,6 +1032,9 @@ export function PopCategoryTree({
                         } else {
                           next.add(code);
                         }
+                        try {
+                          sessionStorage.setItem("pop-tree-expanded-companies", JSON.stringify([...next]));
+                        } catch { /* noop */ }
                         return next;
                       });
                     };