diff --git a/frontend/components/screen/RealtimePreviewDynamic.tsx b/frontend/components/screen/RealtimePreviewDynamic.tsx
index 17615147..9c19405c 100644
--- a/frontend/components/screen/RealtimePreviewDynamic.tsx
+++ b/frontend/components/screen/RealtimePreviewDynamic.tsx
@@ -47,6 +47,7 @@ interface RealtimePreviewProps {
   selectedTabComponentId?: string; // 🆕 선택된 탭 컴포넌트 ID
   onSelectPanelComponent?: (panelSide: "left" | "right", compId: string, comp: any) => void; // 🆕 분할 패널 내부 컴포넌트 선택 콜백
   selectedPanelComponentId?: string; // 🆕 선택된 분할 패널 컴포넌트 ID
+  onNestedPanelSelect?: (splitPanelId: string, panelSide: "left" | "right", compId: string, comp: any) => void;
   onResize?: (componentId: string, newSize: { width: number; height: number }) => void; // 🆕 리사이즈 콜백
 
   // 버튼 액션을 위한 props
@@ -150,6 +151,7 @@ const RealtimePreviewDynamicComponent: React.FC<RealtimePreviewProps> = ({
   selectedTabComponentId, // 🆕 선택된 탭 컴포넌트 ID
   onSelectPanelComponent, // 🆕 분할 패널 내부 컴포넌트 선택 콜백
   selectedPanelComponentId, // 🆕 선택된 분할 패널 컴포넌트 ID
+  onNestedPanelSelect,
   onResize, // 🆕 리사이즈 콜백
 }) => {
   // 🆕 화면 다국어 컨텍스트
@@ -768,6 +770,7 @@ const RealtimePreviewDynamicComponent: React.FC<RealtimePreviewProps> = ({
           selectedTabComponentId={selectedTabComponentId}
           onSelectPanelComponent={onSelectPanelComponent}
           selectedPanelComponentId={selectedPanelComponentId}
+          onNestedPanelSelect={onNestedPanelSelect}
         />
       </div>
 
diff --git a/frontend/components/screen/ScreenDesigner.tsx b/frontend/components/screen/ScreenDesigner.tsx
index e19f01f1..6eeeb4e1 100644
--- a/frontend/components/screen/ScreenDesigner.tsx
+++ b/frontend/components/screen/ScreenDesigner.tsx
@@ -6744,15 +6744,6 @@ export default function ScreenDesigner({
                             const { splitPanelId, panelSide } = selectedPanelComponentInfo;
                             const panelKey = panelSide === "left" ? "leftPanel" : "rightPanel";
 
-                            console.log("🔧 updatePanelComponentProperty 호출:", {
-                              componentId,
-                              path,
-                              value,
-                              splitPanelId,
-                              panelSide,
-                            });
-
-                            // 🆕 안전한 깊은 경로 업데이트 헬퍼 함수
                             const setNestedValue = (obj: any, pathStr: string, val: any): any => {
                               const result = JSON.parse(JSON.stringify(obj));
                               const parts = pathStr.split(".");
@@ -6769,9 +6760,27 @@ export default function ScreenDesigner({
                               return result;
                             };
 
+                            // 중첩 구조 포함 분할패널 찾기 헬퍼
+                            const findSplitPanelInLayout = (components: any[]): { found: any; path: "top" | "nested"; parentTabId?: string; parentTabTabId?: string } | null => {
+                              const direct = components.find((c) => c.id === splitPanelId);
+                              if (direct) return { found: direct, path: "top" };
+                              for (const comp of components) {
+                                const ct = (comp as any)?.componentType || (comp as any)?.overrides?.type;
+                                const cfg = (comp as any)?.componentConfig || (comp as any)?.overrides || {};
+                                if (ct === "tabs-widget" || ct === "v2-tabs-widget") {
+                                  for (const tab of (cfg.tabs || [])) {
+                                    const nested = (tab.components || []).find((c: any) => c.id === splitPanelId);
+                                    if (nested) return { found: nested, path: "nested", parentTabId: comp.id, parentTabTabId: tab.id };
+                                  }
+                                }
+                              }
+                              return null;
+                            };
+
                             setLayout((prevLayout) => {
-                              const splitPanelComponent = prevLayout.components.find((c) => c.id === splitPanelId);
-                              if (!splitPanelComponent) return prevLayout;
+                              const result = findSplitPanelInLayout(prevLayout.components);
+                              if (!result) return prevLayout;
+                              const splitPanelComponent = result.found;
 
                               const currentConfig = (splitPanelComponent as any).componentConfig || {};
                               const panelConfig = currentConfig[panelKey] || {};
@@ -6807,17 +6816,37 @@ export default function ScreenDesigner({
                                 },
                               };
 
-                              // selectedPanelComponentInfo 업데이트
                               setSelectedPanelComponentInfo((prev) =>
                                 prev ? { ...prev, component: updatedComp } : null,
                               );
 
-                              return {
-                                ...prevLayout,
-                                components: prevLayout.components.map((c) =>
-                                  c.id === splitPanelId ? updatedComponent : c,
-                                ),
+                              // 중첩 구조 반영
+                              const applyUpdatedSplitPanel = (layout: any, updated: any, info: any) => {
+                                if (info.path === "top") {
+                                  return { ...layout, components: layout.components.map((c: any) => c.id === splitPanelId ? updated : c) };
+                                }
+                                return {
+                                  ...layout,
+                                  components: layout.components.map((c: any) => {
+                                    if (c.id !== info.parentTabId) return c;
+                                    const cfgKey = c.componentConfig?.tabs ? "componentConfig" : "overrides";
+                                    const cfg = c[cfgKey] || {};
+                                    return {
+                                      ...c,
+                                      [cfgKey]: {
+                                        ...cfg,
+                                        tabs: (cfg.tabs || []).map((t: any) =>
+                                          t.id === info.parentTabTabId
+                                            ? { ...t, components: (t.components || []).map((tc: any) => tc.id === splitPanelId ? updated : tc) }
+                                            : t,
+                                        ),
+                                      },
+                                    };
+                                  }),
+                                };
                               };
+
+                              return applyUpdatedSplitPanel(prevLayout, updatedComponent, result);
                             });
                           };
 
@@ -6827,8 +6856,23 @@ export default function ScreenDesigner({
                             const panelKey = panelSide === "left" ? "leftPanel" : "rightPanel";
 
                             setLayout((prevLayout) => {
-                              const splitPanelComponent = prevLayout.components.find((c) => c.id === splitPanelId);
-                              if (!splitPanelComponent) return prevLayout;
+                              const findResult = (() => {
+                                const direct = prevLayout.components.find((c: any) => c.id === splitPanelId);
+                                if (direct) return { found: direct, path: "top" as const };
+                                for (const comp of prevLayout.components) {
+                                  const ct = (comp as any)?.componentType || (comp as any)?.overrides?.type;
+                                  const cfg = (comp as any)?.componentConfig || (comp as any)?.overrides || {};
+                                  if (ct === "tabs-widget" || ct === "v2-tabs-widget") {
+                                    for (const tab of (cfg.tabs || [])) {
+                                      const nested = (tab.components || []).find((c: any) => c.id === splitPanelId);
+                                      if (nested) return { found: nested, path: "nested" as const, parentTabId: comp.id, parentTabTabId: tab.id };
+                                    }
+                                  }
+                                }
+                                return null;
+                              })();
+                              if (!findResult) return prevLayout;
+                              const splitPanelComponent = findResult.found;
 
                               const currentConfig = (splitPanelComponent as any).componentConfig || {};
                               const panelConfig = currentConfig[panelKey] || {};
@@ -6849,11 +6893,27 @@ export default function ScreenDesigner({
 
                               setSelectedPanelComponentInfo(null);
 
+                              if (findResult.path === "top") {
+                                return { ...prevLayout, components: prevLayout.components.map((c: any) => c.id === splitPanelId ? updatedComponent : c) };
+                              }
                               return {
                                 ...prevLayout,
-                                components: prevLayout.components.map((c) =>
-                                  c.id === splitPanelId ? updatedComponent : c,
-                                ),
+                                components: prevLayout.components.map((c: any) => {
+                                  if (c.id !== findResult.parentTabId) return c;
+                                  const cfgKey = c.componentConfig?.tabs ? "componentConfig" : "overrides";
+                                  const cfg = c[cfgKey] || {};
+                                  return {
+                                    ...c,
+                                    [cfgKey]: {
+                                      ...cfg,
+                                      tabs: (cfg.tabs || []).map((t: any) =>
+                                        t.id === findResult.parentTabTabId
+                                          ? { ...t, components: (t.components || []).map((tc: any) => tc.id === splitPanelId ? updatedComponent : tc) }
+                                          : t,
+                                      ),
+                                    },
+                                  };
+                                }),
                               };
                             });
                           };
@@ -7457,6 +7517,7 @@ export default function ScreenDesigner({
                                 onSelectPanelComponent={(panelSide, compId, comp) =>
                                   handleSelectPanelComponent(component.id, panelSide, compId, comp)
                                 }
+                                onNestedPanelSelect={handleSelectPanelComponent}
                                 selectedPanelComponentId={
                                   selectedPanelComponentInfo?.splitPanelId === component.id
                                     ? selectedPanelComponentInfo.componentId
diff --git a/frontend/lib/registry/DynamicComponentRenderer.tsx b/frontend/lib/registry/DynamicComponentRenderer.tsx
index 8ee1ba20..867c8a86 100644
--- a/frontend/lib/registry/DynamicComponentRenderer.tsx
+++ b/frontend/lib/registry/DynamicComponentRenderer.tsx
@@ -235,6 +235,8 @@ export interface DynamicComponentRendererProps {
   // 🆕 분할 패널 내부 컴포넌트 선택 콜백
   onSelectPanelComponent?: (panelSide: "left" | "right", compId: string, comp: any) => void;
   selectedPanelComponentId?: string;
+  // 중첩된 분할패널 내부 컴포넌트 선택 콜백 (탭 안의 분할패널)
+  onNestedPanelSelect?: (splitPanelId: string, panelSide: "left" | "right", compId: string, comp: any) => void;
   flowSelectedStepId?: number | null;
   onFlowSelectedDataChange?: (selectedData: any[], stepId: number | null) => void;
   // 테이블 새로고침 키
@@ -868,6 +870,7 @@ export const DynamicComponentRenderer: React.FC<DynamicComponentRendererProps> =
           // 🆕 분할 패널 내부 컴포넌트 선택 콜백
           onSelectPanelComponent: props.onSelectPanelComponent,
           selectedPanelComponentId: props.selectedPanelComponentId,
+          onNestedPanelSelect: props.onNestedPanelSelect,
         };
 
         // 렌더러가 클래스인지 함수인지 확인
diff --git a/frontend/lib/registry/components/v2-tabs-widget/tabs-component.tsx b/frontend/lib/registry/components/v2-tabs-widget/tabs-component.tsx
index efd76407..ac6b208e 100644
--- a/frontend/lib/registry/components/v2-tabs-widget/tabs-component.tsx
+++ b/frontend/lib/registry/components/v2-tabs-widget/tabs-component.tsx
@@ -15,7 +15,8 @@ const TabsDesignEditor: React.FC<{
   onUpdateComponent?: (updatedComponent: any) => void;
   onSelectTabComponent?: (tabId: string, compId: string, comp: TabInlineComponent) => void;
   selectedTabComponentId?: string;
-}> = ({ component, tabs, onUpdateComponent, onSelectTabComponent, selectedTabComponentId }) => {
+  onNestedPanelSelect?: (splitPanelId: string, panelSide: "left" | "right", compId: string, comp: any) => void;
+}> = ({ component, tabs, onUpdateComponent, onSelectTabComponent, selectedTabComponentId, onNestedPanelSelect }) => {
   const [activeTabId, setActiveTabId] = useState<string>(tabs[0]?.id || "");
   const [draggingCompId, setDraggingCompId] = useState<string | null>(null);
   const [dragPosition, setDragPosition] = useState<{ x: number; y: number } | null>(null);
@@ -443,7 +444,11 @@ const TabsDesignEditor: React.FC<{
                                 });
                               },
                               onSelectPanelComponent: (panelSide: string, compId: string, panelComp: any) => {
-                                onSelectTabComponent?.(activeTabId, comp.id, { ...comp, _selectedPanelSide: panelSide, _selectedPanelCompId: compId, _selectedPanelComp: panelComp } as any);
+                                if (onNestedPanelSelect) {
+                                  onNestedPanelSelect(comp.id, panelSide as "left" | "right", compId, panelComp);
+                                } else {
+                                  onSelectTabComponent?.(activeTabId, comp.id, comp);
+                                }
                               },
                             } : {})}
                           />
@@ -506,6 +511,7 @@ const TabsWidgetWrapper: React.FC<any> = (props) => {
     onUpdateComponent,
     onSelectTabComponent,
     selectedTabComponentId,
+    onNestedPanelSelect,
     ...restProps 
   } = props;
 
@@ -522,6 +528,7 @@ const TabsWidgetWrapper: React.FC<any> = (props) => {
         onUpdateComponent={onUpdateComponent}
         onSelectTabComponent={onSelectTabComponent}
         selectedTabComponentId={selectedTabComponentId}
+        onNestedPanelSelect={onNestedPanelSelect}
       />
     );
   }