diff --git a/data/src/main/java/com/d83t/bpm/data/datastore/DataStoreManager.kt b/data/src/main/java/com/d83t/bpm/data/datastore/DataStoreManager.kt
index 0f97549..29c92f8 100644
--- a/data/src/main/java/com/d83t/bpm/data/datastore/DataStoreManager.kt
+++ b/data/src/main/java/com/d83t/bpm/data/datastore/DataStoreManager.kt
@@ -3,18 +3,28 @@ package com.d83t.bpm.data.datastore
 import android.content.Context
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import javax.inject.Inject
+import kotlinx.coroutines.flow.flow
 
 class DataStoreManager @Inject constructor(private val context: Context) {
     private val Context.instance: DataStore<Preferences> by preferencesDataStore(name = "bpm")
 
-    fun getKakaoId(): Flow<String> {
+    fun getKakaoId(): Flow<String?> {
         return context.instance.data.map { preferences ->
-            preferences[stringPreferencesKey(name = "kakaoId")] ?: "null"
+            preferences[stringPreferencesKey(name = "kakaoId")]
+        }
+    }
+
+    suspend fun setKakaoUserId(kakaoId : String) : Flow<String?> {
+        return flow {
+            context.instance.edit { preferences ->
+                preferences[stringPreferencesKey(name = "kakaoId")] = kakaoId
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/data/src/main/java/com/d83t/bpm/data/repositoryImpl/SplashRepositoryImpl.kt b/data/src/main/java/com/d83t/bpm/data/repositoryImpl/SplashRepositoryImpl.kt
index f438497..bcbf581 100644
--- a/data/src/main/java/com/d83t/bpm/data/repositoryImpl/SplashRepositoryImpl.kt
+++ b/data/src/main/java/com/d83t/bpm/data/repositoryImpl/SplashRepositoryImpl.kt
@@ -9,7 +9,11 @@ class SplashRepositoryImpl @Inject constructor(
     private val dataStoreManager: DataStoreManager
 ) : SplashRepository {
 
-    override fun getStoredId(): Flow<String> {
+    override fun getKakaoUserId(): Flow<String?> {
         return dataStoreManager.getKakaoId()
     }
+
+    override suspend fun setKakaoUserId(kakaoId : String): Flow<String?> {
+        return dataStoreManager.setKakaoUserId(kakaoId)
+    }
 }
\ No newline at end of file
diff --git a/domain/src/main/java/com/d83t/bpm/domain/repository/SplashRepository.kt b/domain/src/main/java/com/d83t/bpm/domain/repository/SplashRepository.kt
index da8368f..b1d6c4b 100644
--- a/domain/src/main/java/com/d83t/bpm/domain/repository/SplashRepository.kt
+++ b/domain/src/main/java/com/d83t/bpm/domain/repository/SplashRepository.kt
@@ -4,5 +4,7 @@ import kotlinx.coroutines.flow.Flow
 
 interface SplashRepository {
 
-    fun getStoredId(): Flow<String>
+    fun getKakaoUserId(): Flow<String?>
+
+    suspend fun setKakaoUserId(kakaoId : String): Flow<String?>
 }
\ No newline at end of file
diff --git a/domain/src/main/java/com/d83t/bpm/domain/usecase/GetStoredIdUseCase.kt b/domain/src/main/java/com/d83t/bpm/domain/usecase/GetStoredIdUseCase.kt
deleted file mode 100644
index 6076bfa..0000000
--- a/domain/src/main/java/com/d83t/bpm/domain/usecase/GetStoredIdUseCase.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.d83t.bpm.domain.usecase
-
-import com.d83t.bpm.domain.repository.SplashRepository
-import kotlinx.coroutines.flow.Flow
-import javax.inject.Inject
-
-class GetStoredIdUseCase @Inject constructor(
-    private val splashRepository: SplashRepository
-) {
-    operator fun invoke(): Flow<String> {
-        return splashRepository.getStoredId()
-    }
-}
\ No newline at end of file
diff --git a/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/GetKakaoUserIdUseCase.kt b/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/GetKakaoUserIdUseCase.kt
new file mode 100644
index 0000000..4842fa3
--- /dev/null
+++ b/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/GetKakaoUserIdUseCase.kt
@@ -0,0 +1,13 @@
+package com.d83t.bpm.domain.usecase.splash
+
+import com.d83t.bpm.domain.repository.SplashRepository
+import kotlinx.coroutines.flow.Flow
+import javax.inject.Inject
+
+class GetKakaoUserIdUseCase @Inject constructor(
+    private val splashRepository: SplashRepository
+) {
+    operator fun invoke(): Flow<String?> {
+        return splashRepository.getKakaoUserId()
+    }
+}
\ No newline at end of file
diff --git a/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/SetKakaoUserIdUseCase.kt b/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/SetKakaoUserIdUseCase.kt
new file mode 100644
index 0000000..bf460ad
--- /dev/null
+++ b/domain/src/main/java/com/d83t/bpm/domain/usecase/splash/SetKakaoUserIdUseCase.kt
@@ -0,0 +1,13 @@
+package com.d83t.bpm.domain.usecase.splash
+
+import com.d83t.bpm.domain.repository.SplashRepository
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+
+class SetKakaoUserIdUseCase @Inject constructor(
+    private val splashRepository: SplashRepository
+) {
+    suspend operator fun invoke(kakaoId: String): Flow<String?> {
+        return splashRepository.setKakaoUserId(kakaoId)
+    }
+}
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/di/UseCaseModule.kt b/presentation/src/main/java/com/d83t/bpm/presentation/di/UseCaseModule.kt
index 26a2980..19499bb 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/di/UseCaseModule.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/di/UseCaseModule.kt
@@ -3,7 +3,8 @@ package com.d83t.bpm.presentation.di
 import com.d83t.bpm.domain.repository.MainRepository
 import com.d83t.bpm.domain.repository.SplashRepository
 import com.d83t.bpm.domain.usecase.GetSampleTextUseCase
-import com.d83t.bpm.domain.usecase.GetStoredIdUseCase
+import com.d83t.bpm.domain.usecase.splash.GetKakaoUserIdUseCase
+import com.d83t.bpm.domain.usecase.splash.SetKakaoUserIdUseCase
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
@@ -22,7 +23,13 @@ object UseCaseModule {
 
     @Provides
     @ViewModelScoped
-    fun provideGetStoredIdUseCase(splashRepository: SplashRepository): GetStoredIdUseCase {
-        return GetStoredIdUseCase(splashRepository)
+    fun provideGetKakaoUserIdUseCase(splashRepository: SplashRepository): GetKakaoUserIdUseCase {
+        return GetKakaoUserIdUseCase(splashRepository)
+    }
+
+    @Provides
+    @ViewModelScoped
+    fun provideSetKakaoUserIdUseCase(splashRepository: SplashRepository): SetKakaoUserIdUseCase {
+        return SetKakaoUserIdUseCase(splashRepository)
     }
 }
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/ui/main/MainActivity.kt b/presentation/src/main/java/com/d83t/bpm/presentation/ui/main/MainActivity.kt
index b7a8fc0..d8e6f04 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/ui/main/MainActivity.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/ui/main/MainActivity.kt
@@ -1,5 +1,7 @@
 package com.d83t.bpm.presentation.ui.main
 
+import android.content.Context
+import android.content.Intent
 import androidx.activity.viewModels
 import com.d83t.bpm.presentation.base.BaseActivity
 import com.d83t.bpm.presentation.databinding.ActivityMainBinding
@@ -34,4 +36,12 @@ class MainActivity : BaseActivity<ActivityMainBinding>(ActivityMainBinding::infl
 
         }
     }
+
+    companion object {
+
+        fun newIntent(context: Context): Intent {
+            return Intent(context, MainActivity::class.java)
+        }
+
+    }
 }
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashActivity.kt b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashActivity.kt
index 5beda97..6ba0e76 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashActivity.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashActivity.kt
@@ -29,8 +29,15 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import com.d83t.bpm.presentation.R
 import com.d83t.bpm.presentation.base.BaseComponentActivity
+import com.d83t.bpm.presentation.compose.theme.BPMShapes
+import com.d83t.bpm.presentation.compose.theme.BPMTheme
+import com.d83t.bpm.presentation.compose.theme.BPMTypography
+import com.d83t.bpm.presentation.ui.main.MainActivity
 import com.d83t.bpm.presentation.compose.theme.*
 import com.d83t.bpm.presentation.util.repeatCallDefaultOnStarted
+import com.d83t.bpm.presentation.util.showDebugToast
+import com.d83t.bpm.presentation.util.showToast
+import com.kakao.sdk.user.UserApiClient
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.delay
@@ -40,15 +47,22 @@ import kotlinx.coroutines.launch
 @SuppressLint("CustomSplashScreen")
 @AndroidEntryPoint
 class SplashActivity : BaseComponentActivity() {
+
     override val viewModel: SplashViewModel by viewModels()
+
     private val startButtonVisibilityState = mutableStateOf(false)
+
+    private val kakaoLoginInstance: UserApiClient by lazy {
+        UserApiClient.instance
+    }
+
     override fun initUi() {
         setContent {
             BPMTheme {
                 SplashActivityContent(
                     startButtonVisibilityState = startButtonVisibilityState,
                     onClickStartButton = {
-                        // TODO : SignUp With Kakao
+                        setupLogin()
                     }
                 )
             }
@@ -65,17 +79,47 @@ class SplashActivity : BaseComponentActivity() {
                             viewModel.getStoredId()
                         }
                     }
-                    is SplashState.KakaoId -> {
-                        if (state.id == "null") {
+                    is SplashState.SignUp -> {
+                        if (state.id == "null" || state.id.isNullOrEmpty()) {
                             startButtonVisibilityState.value = true
                         } else {
-                            // TODO : SignIn
+                            viewModel.setFinish()
                         }
                     }
+                    SplashState.SignIn -> {
+                        viewModel.setFinish()
+                    }
+                    SplashState.Finish -> {
+                        goToMainActivity()
+                    }
                 }
             }
         }
     }
+
+    private fun setupLogin() {
+        // 카카오톡으로 로그인
+        if (kakaoLoginInstance.isKakaoTalkLoginAvailable(this)) {
+            kakaoLoginInstance.loginWithKakaoTalk(this) { loginInfo, error ->
+                if (error != null) {
+                    // 로그인 실패
+                    showDebugToast("login failed! cause : ${error.message}")
+                    showToast("로그인에 실패하였습니다. 다시 시도해 주세요.")
+                } else if (loginInfo != null) {
+                    // 로그인 성공
+                    viewModel.setLoginId(loginInfo.idToken ?: "")
+                    showDebugToast("login succeed. user token : ${loginInfo.idToken}")
+                }
+            }
+        } else {
+            showToast("로그인에 실패하였습니다. 다시 시도해 주세요.")
+        }
+    }
+
+    private fun goToMainActivity() {
+        startActivity(MainActivity.newIntent(this))
+        finish()
+    }
 }
 
 @Composable
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashState.kt b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashState.kt
index 1a706cd..91017e5 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashState.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashState.kt
@@ -4,5 +4,8 @@ import com.d83t.bpm.presentation.util.ComposeUiState
 
 sealed interface SplashState : ComposeUiState {
     object Init : SplashState
-    data class KakaoId(val id: String) : SplashState
+    data class SignUp(val id: String?) : SplashState
+
+    object SignIn : SplashState
+    object Finish : SplashState
 }
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewEvent.kt b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewEvent.kt
index e84b6e3..6e62b98 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewEvent.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewEvent.kt
@@ -1,5 +1,3 @@
 package com.d83t.bpm.presentation.ui.splash
 
-interface SplashViewEvent {
-    object Click : SplashViewEvent
-}
\ No newline at end of file
+sealed interface SplashViewEvent
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewModel.kt b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewModel.kt
index 37815fb..df05c34 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewModel.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/ui/splash/SplashViewModel.kt
@@ -1,20 +1,28 @@
 package com.d83t.bpm.presentation.ui.splash
 
 import androidx.lifecycle.viewModelScope
-import com.d83t.bpm.domain.usecase.GetStoredIdUseCase
+import com.d83t.bpm.domain.usecase.splash.GetKakaoUserIdUseCase
+import com.d83t.bpm.domain.usecase.splash.SetKakaoUserIdUseCase
 import com.d83t.bpm.presentation.base.BaseViewModel
 import com.d83t.bpm.presentation.di.IoDispatcher
 import com.d83t.bpm.presentation.di.MainDispatcher
 import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
 import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
-import javax.inject.Inject
 
 @HiltViewModel
 class SplashViewModel @Inject constructor(
-    private val getStoredIdUseCase: GetStoredIdUseCase,
+    private val getKakaoUserIdUseCase: GetKakaoUserIdUseCase,
+    private val setKakaoUserIdUseCase: SetKakaoUserIdUseCase,
     @MainDispatcher private val mainDispatcher: CoroutineDispatcher,
     @IoDispatcher private val ioDispatcher: CoroutineDispatcher
 ) : BaseViewModel() {
@@ -27,12 +35,43 @@ class SplashViewModel @Inject constructor(
     val state: StateFlow<SplashState>
         get() = _state
 
+    private val exceptionHandler: CoroutineExceptionHandler by lazy {
+        CoroutineExceptionHandler { coroutineContext, throwable ->
+            when (state.value) {
+                SplashState.SignIn -> {
+                    // TODO : Exception Handling
+                }
+                else -> {
+                    // TODO : Exception Handling
+                }
+            }
+
+        }
+    }
+
     fun getStoredId() {
         viewModelScope.launch(ioDispatcher) {
-            val kakaoId = getStoredIdUseCase().first()
-            withContext(mainDispatcher) {
-                _state.emit(SplashState.KakaoId(kakaoId))
-            }
+            getKakaoUserIdUseCase().onEach {
+                withContext(mainDispatcher) {
+                    _state.emit(SplashState.SignUp(it))
+                }
+            }.launchIn(viewModelScope)
+        }
+    }
+
+    fun setLoginId(kakaoId: String) {
+        viewModelScope.launch(ioDispatcher + exceptionHandler) {
+            setKakaoUserIdUseCase(kakaoId).onEach {
+                withContext(mainDispatcher) {
+                    _state.emit(SplashState.SignUp(it))
+                }
+            }.launchIn(viewModelScope)
+        }
+    }
+
+    fun setFinish() {
+        viewModelScope.launch {
+            _state.emit(SplashState.Finish)
         }
     }
 }
\ No newline at end of file
diff --git a/presentation/src/main/java/com/d83t/bpm/presentation/util/ToastUtils.kt b/presentation/src/main/java/com/d83t/bpm/presentation/util/ToastUtils.kt
index ce07b4c..2db6f78 100644
--- a/presentation/src/main/java/com/d83t/bpm/presentation/util/ToastUtils.kt
+++ b/presentation/src/main/java/com/d83t/bpm/presentation/util/ToastUtils.kt
@@ -5,4 +5,8 @@ import android.widget.Toast
 
 fun Context.showToast(text: String) {
     Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
+}
+
+fun Context.showDebugToast(text: String) {
+    Toast.makeText(this, "Debug Mode! $text", Toast.LENGTH_SHORT).show()
 }
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index 4fb5f46..cd261a4 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -10,6 +10,8 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+
+        maven { url 'https://devrepo.kakao.com/nexus/content/groups/public/' }
     }
 }
 rootProject.name = "BPM"