diff --git a/backend/src/main/java/endolphin/backend/global/google/GoogleCalendarService.java b/backend/src/main/java/endolphin/backend/global/google/GoogleCalendarService.java
index 7a0b7cb9..468a28f0 100644
--- a/backend/src/main/java/endolphin/backend/global/google/GoogleCalendarService.java
+++ b/backend/src/main/java/endolphin/backend/global/google/GoogleCalendarService.java
@@ -65,6 +65,7 @@ public void upsertGoogleCalendar(User user) {
     public void subscribeGoogleCalendar(User user) {
         Calendar calendar = calendarService.getCalendarByUserId(user.getId());
         subscribeToCalendar(calendar, user);
+        syncWithCalendar(calendar.getCalendarId(), user);
     }
 
     public void insertPersonalEvents(List<PersonalEvent> personalEvents) {
diff --git a/backend/src/test/java/endolphin/backend/global/google/GoogleCalendarServiceTest.java b/backend/src/test/java/endolphin/backend/global/google/GoogleCalendarServiceTest.java
index b5f53590..7121a856 100644
--- a/backend/src/test/java/endolphin/backend/global/google/GoogleCalendarServiceTest.java
+++ b/backend/src/test/java/endolphin/backend/global/google/GoogleCalendarServiceTest.java
@@ -111,6 +111,6 @@ void upsertGoogleCalendar_existingCalendar_expired() {
         googleCalendarService.subscribeGoogleCalendar(user);
 
         // then
-        then(retryExecutor).should(times(1)).executeCalendarApiWithRetry(any(), eq(user), eq("calendarId"));
+        then(retryExecutor).should(times(2)).executeCalendarApiWithRetry(any(), eq(user), eq("calendarId"));
     }
 }
\ No newline at end of file