diff --git a/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts b/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
index 777229093..ece716bb3 100644
--- a/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
+++ b/apps/as/src/pages/instl-sncn/lib/form-data-mapper.ts
@@ -49,8 +49,8 @@ export function mapDetailToFormData(data: InstlSncnMngDetResponse): CnfmRegistFo
       envoSeComCd: detDto.envoSeComCd,
       prgrsSttsComCd: detDto.prgrsSttsComCd,
       atchFileGroupId: detDto.atchFileGroupId ?? "",
-      rtlztnFcltSeComCd: detDto.rtlztnFcltSeComCd,
-      rtlztnUsgSeComCd: detDto.rtlztnUsgSeComCd,
+      rtlztnFcltSeComCd: detDto.rtlztnFcltSeComCd ?? "",
+      rtlztnUsgSeComCd: detDto.rtlztnUsgSeComCd ?? "",
       envoSeCdNm: detDto.envoSeCdNm,
       sncnSeCdNm: detDto.sncnSeCdNm,
       taskSeCdNm: detDto.taskSeCdNm,
diff --git a/apps/as/src/pages/instl-sncn/ui/instl-edit-page.tsx b/apps/as/src/pages/instl-sncn/ui/instl-edit-page.tsx
index 2ba751435..01d7dc819 100644
--- a/apps/as/src/pages/instl-sncn/ui/instl-edit-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/instl-edit-page.tsx
@@ -15,7 +15,7 @@ function InstlEditPage({ id }: InstlEditPageProps) {
     return <div className="mt-6 text-xl">수정 대상을 찾을 수 없습니다.</div>;
   }
 
-  return <InstlFormPage mode="edit" initialData={data} />;
+  return <InstlFormPage id={id} mode="edit" initialData={data} />;
 }
 
 export { InstlEditPage };
diff --git a/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx b/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
index 9973648fa..ee21c6341 100644
--- a/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
+++ b/apps/as/src/pages/instl-sncn/ui/instl-form-page.tsx
@@ -5,9 +5,14 @@ import { FormProvider, useForm } from "react-hook-form";
 import { useRouter } from "next/navigation";
 
 import { zodResolver } from "@hookform/resolvers/zod";
+import { useQueryClient } from "@tanstack/react-query";
 
 import { useAlertStore, useUserStore } from "@/shared/lib";
-import { type InstlSncnMngDetResponse, instlSncnService } from "@/entities/instl-sncn";
+import {
+  instlSncnKeys,
+  type InstlSncnMngDetResponse,
+  instlSncnService,
+} from "@/entities/instl-sncn";
 import { Button } from "@common/components";
 
 import {
@@ -26,12 +31,14 @@ import { ContactInfoFormSection } from "./sections/contact-info-form-section";
 import { PrivacyConsentSection } from "./sections/privacy-consent-section";
 
 interface InstlFormPageProps {
+  id?: string;
   mode: "create" | "edit";
   initialData?: InstlSncnMngDetResponse;
   taskSeComCd?: string[];
 }
 
-function InstlFormPage({ mode, initialData, taskSeComCd }: InstlFormPageProps) {
+function InstlFormPage({ id, mode, initialData, taskSeComCd }: InstlFormPageProps) {
+  const queryClient = useQueryClient();
   const router = useRouter();
   const userInfo = useUserStore((state) => state.userInfo);
   const alert = useAlertStore((state) => state.setMessage);
@@ -70,11 +77,12 @@ function InstlFormPage({ mode, initialData, taskSeComCd }: InstlFormPageProps) {
 
       const instlSncnDocNo = await instlSncnService.saveApply(payload);
 
-      alert(isEditMode ? "수정되었습니다." : "저장되었습니다.");
+      alert("저장되었습니다.");
       router.push(`/instl-sncn/${instlSncnDocNo}`);
+      if (isEditMode && id) queryClient.invalidateQueries({ queryKey: instlSncnKeys.detail(id) });
     } catch (error) {
-      console.error(isEditMode ? "수정 실패:" : "저장 실패:", error);
-      alert(isEditMode ? "수정 중 오류가 발생했습니다." : "저장 중 오류가 발생했습니다.");
+      console.error("저장 실패:", error);
+      alert("저장 중 오류가 발생했습니다.");
     } finally {
       setIsSubmitting(false);
     }
@@ -108,7 +116,7 @@ function InstlFormPage({ mode, initialData, taskSeComCd }: InstlFormPageProps) {
               목록
             </Button>
             <Button type="submit" disabled={isSubmitting}>
-              {isEditMode ? "수정" : "저장"}
+              저장
             </Button>
           </div>
         </div>