diff --git a/backend/src/services/meilisearch/index.js b/backend/src/services/meilisearch/index.js
index f75fd6e..655e210 100644
--- a/backend/src/services/meilisearch/index.js
+++ b/backend/src/services/meilisearch/index.js
@@ -15,6 +15,9 @@ const logger = createLogger('Meilisearch');
 const INDEX_NAME = 'schedules';
 const MIN_SCORE = config.meilisearch.minScore;
 
+// 캐시된 현재 활동 멤버 수 (동기화 시 갱신)
+let cachedActiveMemberCount = null;
+
 /**
  * 영문 자판으로 입력된 검색어인지 확인
  */
@@ -39,6 +42,19 @@ export async function resolveMemberNames(db, query) {
   return members.map(m => m.name);
 }
 
+/**
+ * 현재 활동 멤버 수 조회 및 캐시
+ */
+async function getActiveMemberCount(db) {
+  if (cachedActiveMemberCount === null) {
+    const [[{ count }]] = await db.query(
+      'SELECT COUNT(*) as count FROM members WHERE is_former = 0'
+    );
+    cachedActiveMemberCount = count;
+  }
+  return cachedActiveMemberCount;
+}
+
 /**
  * 일정 검색
  * @param {object} meilisearch - Meilisearch 클라이언트
@@ -52,6 +68,8 @@ export async function searchSchedules(meilisearch, db, query, options = {}) {
   const SEARCH_LIMIT = 1000;
 
   try {
+    // 현재 활동 멤버 수 캐시 (formatScheduleResponse에서 사용)
+    await getActiveMemberCount(db);
     const index = meilisearch.index(INDEX_NAME);
 
     const searchOptions = {
@@ -128,10 +146,15 @@ export async function searchSchedules(meilisearch, db, query, options = {}) {
  */
 function formatScheduleResponse(hit) {
   // member_names를 배열로 변환
-  const members = hit.member_names
+  let members = hit.member_names
     ? hit.member_names.split(',').map(name => name.trim()).filter(Boolean)
     : [];
 
+  // 전체 멤버인 경우 "프로미스나인"으로 대체
+  if (cachedActiveMemberCount && members.length === cachedActiveMemberCount) {
+    members = ['프로미스나인'];
+  }
+
   // source 객체 구성 (Meilisearch에는 URL 없음)
   let source = null;
   if (hit.category_id === CATEGORY_IDS.YOUTUBE && hit.source_name) {
@@ -199,7 +222,13 @@ export async function deleteSchedule(meilisearch, scheduleId) {
  */
 export async function syncAllSchedules(meilisearch, db) {
   try {
-    // DB에서 모든 일정 조회
+    // 현재 활동 멤버 수 캐시 갱신
+    const [[{ count }]] = await db.query(
+      'SELECT COUNT(*) as count FROM members WHERE is_former = 0'
+    );
+    cachedActiveMemberCount = count;
+
+    // DB에서 모든 일정 조회 (탈퇴 멤버 제외)
     const [schedules] = await db.query(`
       SELECT
         s.id,
@@ -216,7 +245,7 @@ export async function syncAllSchedules(meilisearch, db) {
       LEFT JOIN schedule_categories c ON s.category_id = c.id
       LEFT JOIN schedule_youtube sy ON s.id = sy.schedule_id
       LEFT JOIN schedule_members sm ON s.id = sm.schedule_id
-      LEFT JOIN members m ON sm.member_id = m.id
+      LEFT JOIN members m ON sm.member_id = m.id AND m.is_former = 0
       GROUP BY s.id
     `);