diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index e152301..2b5e7b0 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -13,6 +13,7 @@
             <option value="$PROJECT_DIR$/app" />
             <option value="$PROJECT_DIR$/common" />
             <option value="$PROJECT_DIR$/common-ui" />
+            <option value="$PROJECT_DIR$/foundation" />
             <option value="$PROJECT_DIR$/home" />
             <option value="$PROJECT_DIR$/onboarding" />
           </set>
diff --git a/app/build.gradle b/app/build.gradle
index b38463a..243d740 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -2,6 +2,8 @@ plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
 }
+apply plugin: 'kotlin-kapt'
+apply plugin: 'dagger.hilt.android.plugin'
 
 android {
     namespace 'com.nocapstone.buddyvet'
@@ -13,7 +15,7 @@ android {
         targetSdk 33
         versionCode 1
         versionName "1.0"
-
+        manifestPlaceholders["NATIVE_APP_KEY"] = "d48bcd0a6e882bce9b756ab78c9acd6e"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
@@ -40,7 +42,10 @@ dependencies {
     api project(path: ':home')
     api project(path: ':onboarding')
     api project(path: ':common-ui')
+    api project(path: ':common')
 
+    implementation "com.google.dagger:hilt-android:$rootProject.hiltVersion"
+    kapt "com.google.dagger:hilt-android-compiler:$rootProject.hiltVersion"
 
     implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.appcompat:appcompat:1.6.0'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 61963d6..c6bbd1d 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.nocapstone.buddyvet"
-    xmlns:tools="http://schemas.android.com/tools">
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.nocapstone.buddyvet">
 
     <application
         android:name=".BuddyVetApplication"
@@ -14,11 +14,24 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Buddyvet"
         tools:targetApi="33">
+
+        <activity
+            android:name=".SplashActivity"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+        </activity>
+
         <activity
             android:name=".MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
+
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
@@ -26,6 +39,20 @@
                 android:name="android.app.lib_name"
                 android:value="" />
         </activity>
+        <activity
+            android:name="com.kakao.sdk.auth.AuthCodeHandlerActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data
+                    android:host="oauth"
+                    android:scheme="kakao${NATIVE_APP_KEY}" />
+            </intent-filter>
+        </activity>
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/nocapstone/buddyvet/BuddyVetApplication.kt b/app/src/main/java/com/nocapstone/buddyvet/BuddyVetApplication.kt
index 1074dcb..675258d 100644
--- a/app/src/main/java/com/nocapstone/buddyvet/BuddyVetApplication.kt
+++ b/app/src/main/java/com/nocapstone/buddyvet/BuddyVetApplication.kt
@@ -3,7 +3,9 @@ package com.nocapstone.buddyvet
 import android.app.Application
 import com.kakao.sdk.common.KakaoSdk
 import com.nocapstone.common.util.NATIVE_APP_KEY
+import dagger.hilt.android.HiltAndroidApp
 
+@HiltAndroidApp
 class BuddyVetApplication  : Application(){
 
     override fun onCreate() {
diff --git a/app/src/main/java/com/nocapstone/buddyvet/SplashActivity.kt b/app/src/main/java/com/nocapstone/buddyvet/SplashActivity.kt
new file mode 100644
index 0000000..35a2ede
--- /dev/null
+++ b/app/src/main/java/com/nocapstone/buddyvet/SplashActivity.kt
@@ -0,0 +1,57 @@
+package com.nocapstone.buddyvet
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import androidx.activity.viewModels
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import com.nocapstone.buddyvet.databinding.ActivitySplashBinding
+import com.nocapstone.onboarding.LoginUtil
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+
+
+class SplashActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivitySplashBinding
+    private val viewModel: SplashViewModel by viewModels()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_splash)
+    }
+
+
+    private fun tryAutoLogin() {
+        lifecycleScope.launch {
+            lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                launch {
+                    // 하나라도 실패했을 경우
+                    viewModel.failure.collectLatest {
+                        if (it >= 1){} // Todo Login 실패 로직
+                    }
+                }
+                launch {
+                    viewModel.success.collectLatest {
+                        if (it == 2){} // Todo Login 성공 로직
+                    }
+                }
+            }
+        }
+
+        viewModel.with
+
+    }
+
+
+    //LoginUtil에 Login로직 시행
+    private fun loginWithKakao() {
+        LoginUtil.loginWithKaKao(this, { _, _ ->
+            viewModel.addSuccess()
+        }, { _, _ ->
+            viewModel.addFailure()
+        })
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/nocapstone/buddyvet/SplashViewModel.kt b/app/src/main/java/com/nocapstone/buddyvet/SplashViewModel.kt
new file mode 100644
index 0000000..a5b182e
--- /dev/null
+++ b/app/src/main/java/com/nocapstone/buddyvet/SplashViewModel.kt
@@ -0,0 +1,31 @@
+package com.nocapstone.buddyvet
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class SplashViewModel : ViewModel() {
+
+    private val _success = MutableStateFlow(0)
+    val success : StateFlow<Int> = _success
+
+    private val _failure = MutableStateFlow(0)
+    val failure: StateFlow<Int> = _failure
+
+    fun addSuccess() {
+        _success.value++
+    }
+
+    fun addFailure() {
+        _failure.value++
+    }
+
+    fun withRefreshToken(callback: (String?) -> Unit) {
+        viewModelScope.launch {
+            callback.invoke()
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_splash.xml b/app/src/main/res/layout/activity_splash.xml
new file mode 100644
index 0000000..398779a
--- /dev/null
+++ b/app/src/main/res/layout/activity_splash.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".SplashActivity">
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+
+</layout>
diff --git a/build.gradle b/build.gradle
index c35af24..c724467 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,9 +14,17 @@ buildscript {
         fragment_version = '1.5.5'
         activity_version = '1.6.1'
         kakao_version = '2.12.1'
+        dataStorePreferences_version = '1.0.0'
+
+        retrofit2Version = '2.9.0'
+        okHttpVersion = '4.10.0'
+
+        hiltVersion = '2.44'
+
     }
 
     dependencies {
+        classpath "com.google.dagger:hilt-android-gradle-plugin:$hiltVersion"
         classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
     }
 
diff --git a/common-ui/build.gradle b/common-ui/build.gradle
index 4f15764..ffd6404 100644
--- a/common-ui/build.gradle
+++ b/common-ui/build.gradle
@@ -2,7 +2,8 @@ plugins {
     id 'com.android.library'
     id 'org.jetbrains.kotlin.android'
 }
-
+apply plugin: 'kotlin-kapt'
+apply plugin: 'dagger.hilt.android.plugin'
 
 
 android {
@@ -37,10 +38,15 @@ android {
 
 dependencies {
 
+    api project(path: ':foundation')
+
+
     api "androidx.navigation:navigation-fragment-ktx:$rootProject.nav_version"
     api "androidx.navigation:navigation-ui-ktx:$rootProject.nav_version"
     implementation "androidx.activity:activity-ktx:$rootProject.activity_version"
 
+    implementation "com.google.dagger:hilt-android:$rootProject.hiltVersion"
+    kapt "com.google.dagger:hilt-android-compiler:$rootProject.hiltVersion"
 
     implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.appcompat:appcompat:1.6.0'
diff --git a/common/build.gradle b/common/build.gradle
index 85ba5ca..6636918 100644
--- a/common/build.gradle
+++ b/common/build.gradle
@@ -2,6 +2,8 @@ plugins {
     id 'com.android.library'
     id 'org.jetbrains.kotlin.android'
 }
+apply plugin: 'kotlin-kapt'
+apply plugin: 'dagger.hilt.android.plugin'
 
 android {
     namespace 'com.nocapstone.common'
@@ -32,9 +34,17 @@ android {
 
 dependencies {
 
-    api "com.kakao.sdk:v2-all:$rootProject.kakao_version"
+    api project(path: ':foundation')
+
+
+    // Preferences DataStore
+    implementation("androidx.datastore:datastore-preferences:$rootProject.dataStorePreferences_version")
 
 
+    api "com.kakao.sdk:v2-all:$rootProject.kakao_version"
+
+    implementation "com.google.dagger:hilt-android:$rootProject.hiltVersion"
+    kapt "com.google.dagger:hilt-android-compiler:$rootProject.hiltVersion"
 
     implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.appcompat:appcompat:1.6.0'
diff --git a/common/src/main/java/com/nocapstone/common/util/DataStoreUseCase.kt b/common/src/main/java/com/nocapstone/common/util/DataStoreUseCase.kt
new file mode 100644
index 0000000..4e8e91c
--- /dev/null
+++ b/common/src/main/java/com/nocapstone/common/util/DataStoreUseCase.kt
@@ -0,0 +1,14 @@
+package com.nocapstone.common.util
+
+import androidx.datastore.core.DataStore
+import kotlinx.coroutines.flow.Flow
+import java.util.prefs.Preferences
+
+@Singletone
+class DataStoreUseCase(private val dataStore: DataStore<Preferences>) {
+
+    val refreshToken: Flow<String?> =
+        dataStore.data.map { preferences -> preferences[refreshTokenKey] }
+
+
+}
\ No newline at end of file
diff --git a/foundation/.gitignore b/foundation/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/foundation/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/foundation/build.gradle b/foundation/build.gradle
new file mode 100644
index 0000000..00e2004
--- /dev/null
+++ b/foundation/build.gradle
@@ -0,0 +1,46 @@
+plugins {
+    id 'com.android.library'
+    id 'org.jetbrains.kotlin.android'
+}
+apply plugin: 'kotlin-kapt'
+apply plugin: 'dagger.hilt.android.plugin'
+
+
+android {
+    namespace 'com.example.foundation'
+    compileSdk 33
+
+    defaultConfig {
+        minSdk 23
+        targetSdk 33
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        consumerProguardFiles "consumer-rules.pro"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+    // Retrofit2
+    api "com.squareup.okhttp3:okhttp:$rootProject.okHttpVersion"
+    api "com.squareup.okhttp3:logging-interceptor:$rootProject.okHttpVersion"
+    api "com.squareup.retrofit2:retrofit:$rootProject.retrofit2Version"
+    api "com.squareup.retrofit2:converter-gson:$rootProject.retrofit2Version"
+
+    // Hilt
+    implementation "com.google.dagger:hilt-android:$rootProject.hiltVersion"
+    kapt "com.google.dagger:hilt-android-compiler:$rootProject.hiltVersion"
+}
\ No newline at end of file
diff --git a/foundation/consumer-rules.pro b/foundation/consumer-rules.pro
new file mode 100644
index 0000000..e69de29
diff --git a/foundation/proguard-rules.pro b/foundation/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/foundation/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/foundation/src/androidTest/java/com/example/foundation/ExampleInstrumentedTest.kt b/foundation/src/androidTest/java/com/example/foundation/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..8379c8f
--- /dev/null
+++ b/foundation/src/androidTest/java/com/example/foundation/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package com.example.foundation
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.foundation.test", appContext.packageName)
+    }
+}
\ No newline at end of file
diff --git a/foundation/src/main/AndroidManifest.xml b/foundation/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..a5918e6
--- /dev/null
+++ b/foundation/src/main/AndroidManifest.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>
\ No newline at end of file
diff --git a/foundation/src/test/java/com/example/foundation/ExampleUnitTest.kt b/foundation/src/test/java/com/example/foundation/ExampleUnitTest.kt
new file mode 100644
index 0000000..756bb8c
--- /dev/null
+++ b/foundation/src/test/java/com/example/foundation/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package com.example.foundation
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}
\ No newline at end of file
diff --git a/onboarding/build.gradle b/onboarding/build.gradle
index 153654f..3874499 100644
--- a/onboarding/build.gradle
+++ b/onboarding/build.gradle
@@ -45,6 +45,7 @@ dependencies {
     implementation 'androidx.core:core-ktx:1.9.0'
     implementation 'androidx.appcompat:appcompat:1.6.0'
     implementation 'com.google.android.material:material:1.8.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
diff --git a/onboarding/src/main/AndroidManifest.xml b/onboarding/src/main/AndroidManifest.xml
index a5918e6..b2d3ea1 100644
--- a/onboarding/src/main/AndroidManifest.xml
+++ b/onboarding/src/main/AndroidManifest.xml
@@ -1,4 +1,2 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
-
-</manifest>
\ No newline at end of file
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" />
diff --git a/onboarding/src/main/java/com/nocapstone/onboarding/LoginFragment.kt b/onboarding/src/main/java/com/nocapstone/onboarding/LoginFragment.kt
index 4e84c33..74f21dd 100644
--- a/onboarding/src/main/java/com/nocapstone/onboarding/LoginFragment.kt
+++ b/onboarding/src/main/java/com/nocapstone/onboarding/LoginFragment.kt
@@ -1,5 +1,6 @@
 package com.nocapstone.onboarding
 
+import android.content.Context
 import android.os.Bundle
 import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
@@ -7,6 +8,10 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.activity.OnBackPressedCallback
 import androidx.navigation.fragment.findNavController
+import com.kakao.sdk.auth.model.OAuthToken
+import com.kakao.sdk.common.model.ClientError
+import com.kakao.sdk.common.model.ClientErrorCause
+import com.kakao.sdk.user.UserApiClient
 import com.nocapstone.onboarding.databinding.FragmentLoginBinding
 
 
diff --git a/onboarding/src/main/java/com/nocapstone/onboarding/LoginUtil.kt b/onboarding/src/main/java/com/nocapstone/onboarding/LoginUtil.kt
new file mode 100644
index 0000000..79aaf93
--- /dev/null
+++ b/onboarding/src/main/java/com/nocapstone/onboarding/LoginUtil.kt
@@ -0,0 +1,50 @@
+package com.nocapstone.onboarding
+
+import android.content.Context
+import com.kakao.sdk.auth.model.OAuthToken
+import com.kakao.sdk.common.model.ClientError
+import com.kakao.sdk.common.model.ClientErrorCause
+import com.kakao.sdk.user.UserApiClient
+
+class LoginUtil {
+
+    companion object {
+
+        fun loginWithKaKao(
+            context: Context,
+            onLoginSuccess: (OAuthToken?, Throwable?) -> Unit,
+            onLoginFailure: (OAuthToken?, Throwable?) -> Unit
+        ) {
+            val callback: (OAuthToken?, Throwable?) -> Unit = { token, error ->
+                // 에러가 비어있지 않다면 즉 에러가 존재한다면
+                if (error != null) onLoginFailure(token, error)
+                // 토큰이 비어있지 않다면 즉 토근이 존재한다면
+                else if (token != null) onLoginSuccess(token, error)
+            }
+
+            // 카카오톡이 설치되어 있다면 카카오톡으로 로그인, 아니면 카카오계정으로 로그인
+            if (UserApiClient.instance.isKakaoTalkLoginAvailable(context)) {
+                UserApiClient.instance.loginWithKakaoTalk(context) { token, error ->
+                    // 카카오톡에 연결된 카카오계정이 없는 경우, 카카오계정으로 로그인 시도한다.
+                    if (error != null) {
+                        onLoginFailure(token, error)
+
+                        // 단, 사용자가 의독적로 로그인을 취소한 경우는 제외
+                        if (error is ClientError && error.reason == ClientErrorCause.Cancelled) {
+                            onLoginFailure(token, error)
+                            return@loginWithKakaoTalk
+                        }
+                        //카카오 계정으로 로그인
+                        UserApiClient.instance.loginWithKakaoAccount(context, callback = callback)
+                    } else if (token != null) onLoginSuccess(token, error)
+                }
+            }
+            // 카카오톡이 설치되어 있지 않다면 카카오 계정으로 로그인
+            else {
+                UserApiClient.instance.loginWithKakaoAccount(context, callback = callback)
+            }
+
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/onboarding/src/main/res/layout/fragment_on_boarding1.xml b/onboarding/src/main/res/layout/fragment_on_boarding1.xml
index fbbac86..2dba660 100644
--- a/onboarding/src/main/res/layout/fragment_on_boarding1.xml
+++ b/onboarding/src/main/res/layout/fragment_on_boarding1.xml
@@ -7,6 +7,7 @@
         android:layout_height="match_parent"
         tools:context=".OnBoarding1Fragment">
 
+
         <!-- TODO: Update blank fragment layout -->
         <TextView
             android:layout_width="match_parent"
diff --git a/settings.gradle b/settings.gradle
index 7f8da37..c6759b4 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -19,3 +19,4 @@ include ':home'
 include ':common'
 include ':common-ui'
 include ':onboarding'
+include ':foundation'