diff --git a/core/design-system/src/main/res/values/strings.xml b/core/design-system/src/main/res/values/strings.xml
index 235114872..75332c1b4 100644
--- a/core/design-system/src/main/res/values/strings.xml
+++ b/core/design-system/src/main/res/values/strings.xml
@@ -192,6 +192,7 @@
     <string name="onboarding_profile_helper">닉네임 2~8자</string>
     <string name="onboarding_profile_button_title">완료</string>
     <string name="onboarding_profile_invalid_name_length_toast">2자에서 8자 이내로 닉네임을 입력해주세요.</string>
+    <string name="onboarding_anniversary_already_registered_toast">짝꿍이 기념일을 먼저 등록했어요</string>
     <string name="onboarding_profile_setup_fail">프로필 설정 요청에 실패했습니다.</string>
 
     <string name="onboarding_couple_connect_description">짝꿍과 연결하고\n함께 키피럽 시작하세요</string>
diff --git a/feature/onboarding/src/main/java/com/twix/onboarding/OnBoardingViewModel.kt b/feature/onboarding/src/main/java/com/twix/onboarding/OnBoardingViewModel.kt
index c27b82fc7..497735b6c 100644
--- a/feature/onboarding/src/main/java/com/twix/onboarding/OnBoardingViewModel.kt
+++ b/feature/onboarding/src/main/java/com/twix/onboarding/OnBoardingViewModel.kt
@@ -23,7 +23,7 @@ class OnBoardingViewModel(
     private val onBoardingRepository: OnBoardingRepository,
     private val notificationRepository: NotificationRepository,
 ) : BaseViewModel<OnBoardingUiState, OnBoardingIntent, OnBoardingSideEffect>(OnBoardingUiState()) {
-    private var pollingJob: Job? = null
+    private var onboardingStatusJob: Job? = null
     private var connectCoupleJob: Job? = null
 
     init {
@@ -70,6 +70,8 @@ class OnBoardingViewModel(
             // 디데이 설정 화면
             is OnBoardingIntent.SelectDate -> reduceDday(intent.value)
             OnBoardingIntent.SubmitDday -> anniversarySetup()
+            OnBoardingIntent.StartDdayPollingStatus -> startDdayPolling()
+            OnBoardingIntent.StopDdayPollingStatus -> stopPolling()
 
             is OnBoardingIntent.SubmitMarketingConsent ->
                 initNotificationSettings(
@@ -81,14 +83,28 @@ class OnBoardingViewModel(
     }
 
     private fun startPolling() {
-        if (pollingJob?.isActive == true) return
-        pollingJob =
+        startStatusPolling { status ->
+            if (status == OnboardingStatus.COUPLE_CONNECTION) return@startStatusPolling false
+
+            emitSideEffect(OnBoardingSideEffect.CoupleConnection.NavigateToNext)
+            true
+        }
+    }
+
+    private fun startDdayPolling() {
+        startStatusPolling { status ->
+            if (status != OnboardingStatus.COMPLETED) return@startStatusPolling false
+
+            showAnniversaryAlreadyRegisteredToast()
+            emitSideEffect(OnBoardingSideEffect.DdaySetting.NavigateToHome)
+            true
+        }
+    }
+
+    private fun startStatusPolling(onStatusFetched: suspend (OnboardingStatus) -> Boolean) {
+        if (onboardingStatusJob?.isActive == true) return
+        onboardingStatusJob =
             viewModelScope.launch {
-                /**
-                 * 네트워크 오류 등으로 API 호출이 연속으로 실패한 횟수
-                 * 성공 응답을 받으면 0으로 리셋되며, MAX_POLLING_FAILURE_COUNT에 도달하면 폴링을 중단한다.
-                 * 일시적인 오류에는 폴링을 유지하되, 지속적인 오류 상황에서 무한 루프를 방지하기 위해 사용한다.
-                 * **/
                 var consecutiveFailureCount = 0
 
                 while (isActive) {
@@ -96,16 +112,15 @@ class OnBoardingViewModel(
                     when (val result = onBoardingRepository.fetchOnboardingStatus()) {
                         is AppResult.Success -> {
                             consecutiveFailureCount = 0
-                            if (result.data != OnboardingStatus.COUPLE_CONNECTION) {
-                                stopPolling()
-                                emitSideEffect(OnBoardingSideEffect.CoupleConnection.NavigateToNext)
+                            if (onStatusFetched(result.data)) {
+                                onboardingStatusJob = null
                                 break
                             }
                         }
 
                         is AppResult.Error -> {
                             if (++consecutiveFailureCount >= MAX_POLLING_FAILURE_COUNT) {
-                                stopPolling()
+                                onboardingStatusJob = null
                                 break
                             }
                         }
@@ -115,8 +130,8 @@ class OnBoardingViewModel(
     }
 
     private fun stopPolling() {
-        pollingJob?.cancel()
-        pollingJob = null
+        onboardingStatusJob?.cancel()
+        onboardingStatusJob = null
     }
 
     private fun reduceInviteCode(value: String) {
@@ -198,21 +213,29 @@ class OnBoardingViewModel(
         launchResult(
             block = { onBoardingRepository.fetchOnboardingStatus() },
             onSuccess = { onboardingStatus ->
-                val sideEffect =
-                    when (onboardingStatus) {
-                        OnboardingStatus.ANNIVERSARY_SETUP ->
-                            OnBoardingSideEffect.ProfileSetting.NavigateToNext
+                when (onboardingStatus) {
+                    OnboardingStatus.ANNIVERSARY_SETUP ->
+                        tryEmitSideEffect(OnBoardingSideEffect.ProfileSetting.NavigateToNext)
 
-                        OnboardingStatus.COMPLETED ->
-                            OnBoardingSideEffect.ProfileSetting.NavigateToHome
+                    OnboardingStatus.COMPLETED ->
+                        onProfileAnniversaryAlreadyRegistered()
 
-                        else -> return@launchResult
-                    }
-                tryEmitSideEffect(sideEffect)
+                    else -> return@launchResult
+                }
             },
         )
     }
 
+    private fun onProfileAnniversaryAlreadyRegistered() {
+        tryEmitSideEffect(
+            OnBoardingSideEffect.ShowToast(
+                message = R.string.onboarding_anniversary_already_registered_toast,
+                type = ToastType.DEFAULT,
+            ),
+        )
+        tryEmitSideEffect(OnBoardingSideEffect.ProfileSetting.NavigateToHome)
+    }
+
     private fun reduceDday(value: LocalDate) {
         reduce {
             copy(
@@ -255,6 +278,10 @@ class OnBoardingViewModel(
         emitSideEffect(OnBoardingSideEffect.ShowToast(message, type))
     }
 
+    private suspend fun showAnniversaryAlreadyRegisteredToast() {
+        showToast(R.string.onboarding_anniversary_already_registered_toast, ToastType.DEFAULT)
+    }
+
     companion object {
         private const val ALREADY_USED_INVITE_CODE_MESSAGE = "이미 사용된 초대 코드입니다."
         private const val INVALID_INVITE_CODE_MESSAGE = "유효하지 않은 초대 코드입니다."
diff --git a/feature/onboarding/src/main/java/com/twix/onboarding/contract/OnBoardingIntent.kt b/feature/onboarding/src/main/java/com/twix/onboarding/contract/OnBoardingIntent.kt
index 72fcb4aa8..debbc4251 100644
--- a/feature/onboarding/src/main/java/com/twix/onboarding/contract/OnBoardingIntent.kt
+++ b/feature/onboarding/src/main/java/com/twix/onboarding/contract/OnBoardingIntent.kt
@@ -35,4 +35,8 @@ sealed interface OnBoardingIntent : Intent {
     data object StartPollingStatus : OnBoardingIntent
 
     data object StopPollingStatus : OnBoardingIntent
+
+    data object StartDdayPollingStatus : OnBoardingIntent
+
+    data object StopDdayPollingStatus : OnBoardingIntent
 }
diff --git a/feature/onboarding/src/main/java/com/twix/onboarding/dday/DdayRoute.kt b/feature/onboarding/src/main/java/com/twix/onboarding/dday/DdayRoute.kt
index 50c9c139a..af0e01c3c 100644
--- a/feature/onboarding/src/main/java/com/twix/onboarding/dday/DdayRoute.kt
+++ b/feature/onboarding/src/main/java/com/twix/onboarding/dday/DdayRoute.kt
@@ -10,6 +10,7 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.statusBarsPadding
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -54,6 +55,13 @@ fun DdayRoute(
     val currentContext by rememberUpdatedState(context)
     var showCalendarBottomSheet by remember { mutableStateOf(false) }
 
+    DisposableEffect(Unit) {
+        viewModel.dispatch(OnBoardingIntent.StartDdayPollingStatus)
+        onDispose {
+            viewModel.dispatch(OnBoardingIntent.StopDdayPollingStatus)
+        }
+    }
+
     ObserveAsEvents(viewModel.sideEffect) { sideEffect ->
         when (sideEffect) {
             OnBoardingSideEffect.DdaySetting.NavigateToHome -> navigateToHome()