diff --git a/app/build.gradle b/app/build.gradle
index 57ebd699..b5d24897 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -78,6 +78,8 @@ dependencies {
     implementation 'com.jakewharton.threetenabp:threetenabp:1.4.4'
     implementation 'com.prolificinteractive:material-calendarview:1.4.3'
     implementation 'androidx.recyclerview:recyclerview:1.3.0'
+    implementation 'com.google.android.datatransport:transport-runtime:3.1.2'
+    implementation 'com.google.android.gms:play-services-base:18.0.1'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
@@ -108,4 +110,10 @@ dependencies {
 //    implementation group: 'com.kakao.sdk', name: 'kakaolink', version: '1.30.5'
 
     implementation "com.kakao.sdk:v2-user:2.5.0" // 카카오 로그인
+
+    implementation 'com.google.dagger:hilt-android:2.47'
+    annotationProcessor 'com.google.dagger:hilt-compiler:2.47'
+
+//    implementation "androidx.security:security-crypto:1.0.0"
+
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 37cac08e..07d27879 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -16,40 +16,41 @@
     <uses-feature
         android:name="android.hardware.camera"
         android:required="true" />
+
     <application
         android:name=".App"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:fullBackupContent="@xml/backup_rules"
-        android:icon="@mipmap/ic_launcher"
+        android:icon="@drawable/image_logo_none"
         android:label="@string/app_name"
         android:networkSecurityConfig="@xml/network_security_config"
         android:requestLegacyExternalStorage="true"
-        android:roundIcon="@mipmap/ic_launcher_round"
+        android:roundIcon="@drawable/image_logo_none"
         android:supportsRtl="true"
         android:theme="@style/Theme.EatSSUAndroid"
         android:usesCleartextTraffic="true"
         tools:replace="android:usesCleartextTraffic"
         tools:targetApi="31">
         <activity
-            android:name="com.eatssu.android.ui.login.SocialLoginActivity"
+            android:name=".ui.login.SocialLoginActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
         </activity>
+
         <meta-data
             android:name="com.kakao.sdk.AppKey"
-            android:value="$kakao_native_app_key" />
-<!--        <meta-data-->
-<!--            android:name="com.kakao.sdk.AppKey"-->
-<!--            android:value="${APP_KEY}" />-->
-
+            android:value="$kakao_native_app_key" /> <!-- <meta-data -->
+        <!-- android:name="com.kakao.sdk.AppKey" -->
+        <!-- android:value="${APP_KEY}" /> -->
         <activity
             android:name=".ui.login.LoginActivity"
             android:exported="true">
@@ -58,11 +59,11 @@
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
         </activity>
-
         <activity
             android:name="com.kakao.sdk.auth.AuthCodeHandlerActivity"
             android:exported="true"
@@ -79,7 +80,6 @@
                     android:scheme="@string/kakao_redirection_scheme" />
             </intent-filter>
         </activity>
-
         <activity
             android:name=".ui.BaseActivity"
             android:exported="false">
@@ -89,13 +89,14 @@
         </activity>
         <activity
             android:name=".ui.login.SignUpActivity"
-            android:windowSoftInputMode="adjustResize"
-            android:exported="true">
+            android:exported="true"
+            android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
@@ -109,6 +110,7 @@
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
@@ -122,11 +124,11 @@
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
         </activity>
-
         <activity
             android:name=".ui.mypage.MyReviewListActivity"
             android:exported="true">
@@ -179,11 +181,11 @@
             android:exported="true"
             android:windowSoftInputMode="adjustResize">
             <intent-filter>
-
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
+
             <meta-data
                 android:name="android.app.lib_name"
                 android:value="" />
diff --git a/app/src/main/java/com/eatssu/android/data/RefreshTokenService.kt b/app/src/main/java/com/eatssu/android/data/RefreshTokenService.kt
new file mode 100644
index 00000000..42ffceaa
--- /dev/null
+++ b/app/src/main/java/com/eatssu/android/data/RefreshTokenService.kt
@@ -0,0 +1,24 @@
+package com.eatssu.android.data
+
+import RetrofitImpl.retrofit
+import com.eatssu.android.App
+import com.eatssu.android.data.service.UserService
+
+object RefreshTokenService {
+
+    private val userService = retrofit.create(UserService::class.java)
+
+    fun refreshToken(): String {
+        val res = userService.getNewToken().execute()
+        if (res.isSuccessful) {
+            val newAccessToken = res.body()?.accessToken ?: ""
+            val newRefreshToken = res.body()?.refreshToken ?: ""
+            if (newAccessToken.isNotBlank()) {
+                App.token_prefs.accessToken = newAccessToken
+                App.token_prefs.refreshToken = newRefreshToken
+                return newAccessToken
+            }
+        }
+        throw IllegalStateException("토큰 재발급 실패")
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/eatssu/android/data/RetrofitImpl.kt b/app/src/main/java/com/eatssu/android/data/RetrofitImpl.kt
index 9c771267..bd9c1ca1 100644
--- a/app/src/main/java/com/eatssu/android/data/RetrofitImpl.kt
+++ b/app/src/main/java/com/eatssu/android/data/RetrofitImpl.kt
@@ -1,5 +1,6 @@
 import com.eatssu.android.App
 import com.eatssu.android.BuildConfig
+import com.eatssu.android.data.TokenAuthenticator
 import okhttp3.*
 import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
@@ -48,6 +49,7 @@ object RetrofitImpl {
         OkHttpClient.Builder()
             .addInterceptor(httpLoggingInterceptor)
             .addInterceptor(AppInterceptor())
+            .authenticator(TokenAuthenticator())
             .build()
     }
 
diff --git a/app/src/main/java/com/eatssu/android/data/TokenAuthenticator.kt b/app/src/main/java/com/eatssu/android/data/TokenAuthenticator.kt
index c5289fc8..9b2432e8 100644
--- a/app/src/main/java/com/eatssu/android/data/TokenAuthenticator.kt
+++ b/app/src/main/java/com/eatssu/android/data/TokenAuthenticator.kt
@@ -1,102 +1,25 @@
 package com.eatssu.android.data
 
-import android.content.Context
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.GlobalScope
-import kotlinx.coroutines.async
-import kotlinx.coroutines.runBlocking
+import android.util.Log
 import okhttp3.Authenticator
 import okhttp3.Request
 import okhttp3.Response
 import okhttp3.Route
-import retrofit2.Retrofit
 
-//class TokenAuthenticator  constructor(
-//    val context: Context,
-//    private val refreshToken: String,
-//) : Authenticator {
-//
-//    companion object {
-//        private val TAG = TokenAuthenticator::class.java.simpleName
-//    }
-//
-//    override fun authenticate(route: Route?, response: Response): Request? {
-//
-//        if (response.code == 401) {
-//
-//            val refreshToken = CommonHelper.getRefreshToken(sharedPref)
-//            val getNewDeviceToken = GlobalScope.async(Dispatchers.Default) {
-//                getNewDeviceToken(refreshToken)
-//            }
-//
-//            val token = runBlocking {
-//                getNewDeviceToken.await()
-//            }
-//            if(token != null) {
-//                return getRequest(response, token)
-//            }
-//        }
-//        return null
-//    }
-//
-//    private suspend inline fun getNewDeviceToken(token: String): String? {
-//        return GlobalScope.async(Dispatchers.Default) {
-//            callApiNewDeviceToken(token)
-//        }.await()
-//    }
-//
-//
-//    private suspend inline fun callApiNewDeviceToken(token: String) : String? = suspendCoroutine { continuation ->
-//        createWebService<Api>()
-//            .refreshToken(RefreshToken(token))
-//            .with(rx)
-//            .response(object : ApiCallback<Token>{
-//                override fun success(data: Token?) {
-//                    if(data != null) {
-//                        CommonHelper.saveTokenInfo(sharedPref, data)
-//                        continuation.resume(data.accessToken)
-//                    } else {
-//                        continuation.resume(null)
-//                    }
-//                }
-//
-//                override fun error(statusCode: Int, message: String?) {
-//                    continuation.resume(null)
-//                }
-//            })
-//
-//        return@suspendCoroutine
-//    }
-//
-//    private val okHttp =  OkHttpClient.Builder()
-//        .connectTimeout(TIMEOUT_LIMIT, TimeUnit.SECONDS)
-//        .readTimeout(TIMEOUT_LIMIT, TimeUnit.SECONDS)
-//        .writeTimeout(TIMEOUT_LIMIT, TimeUnit.SECONDS)
-//        .addInterceptor(HttpLoggingInterceptor().apply {
-//            level = if (BuildConfig.DEBUG) {
-//                HttpLoggingInterceptor.Level.BODY
-//            } else {
-//                HttpLoggingInterceptor.Level.NONE
-//            }
-//        })
-//        .build()
-//
-//    private inline fun <reified T> createWebService(): T {
-//        val retrofit = Retrofit.Builder()
-//            .baseUrl(BuildConfig.SERVER_URL)
-//            .client(okHttp)
-//            .addConverterFactory(GsonConverterFactory.create(
-//                GsonBuilder().serializeNulls().create()
-//            ))
-//            .addCallAdapterFactory(RxJava2CallAdapterFactory.create()).build()
-//        return retrofit.create(T::class.java)
-//    }
-//
-//    private fun getRequest(response: Response, token: String): Request {
-//        return response.request
-//            .newBuilder()
-//            .removeHeader("Authorization")
-//            .addHeader("Authorization", "Bearer $token")
-//            .build()
-//    }
-//}
\ No newline at end of file
+class TokenAuthenticator: Authenticator {
+    override fun authenticate(route: Route?, response: Response): Request? {
+        Log.i("Authenticator", response.toString())
+        Log.i("Authenticator", "토큰 재발급 시도")
+        return try {
+            val newAccessToken = RefreshTokenService.refreshToken()
+            Log.i("Authenticator", "토큰 재발급 성공 : $newAccessToken")
+            response.request.newBuilder()
+                .removeHeader("Bearer").apply {
+                    addHeader("Bearer", newAccessToken)
+                }.build() // 토큰 재발급이 성공했다면, 기존 헤더를 지우고, 새로운 해더를 단다.
+        } catch (e: Exception) {
+            e.printStackTrace()
+            null // 만약 토큰 재발급이 실패했다면 헤더에 아무것도 추가하지 않는다.
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/eatssu/android/ui/login/SocialLoginActivity.kt b/app/src/main/java/com/eatssu/android/ui/login/SocialLoginActivity.kt
index 638ef6a7..fe129f22 100644
--- a/app/src/main/java/com/eatssu/android/ui/login/SocialLoginActivity.kt
+++ b/app/src/main/java/com/eatssu/android/ui/login/SocialLoginActivity.kt
@@ -11,6 +11,7 @@ import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.lifecycleScope
 import com.eatssu.android.App
+import com.eatssu.android.data.MySharedPreferences
 import com.eatssu.android.data.model.request.loginWithKakaoRequest
 import com.eatssu.android.data.model.response.TokenResponse
 import com.eatssu.android.data.service.OauthService
@@ -69,6 +70,31 @@ class SocialLoginActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         binding = ActivitySocialLoginBinding.inflate(layoutInflater)
         setContentView(binding.root)
+
+        //카카오 로그인에서 제공하는 자동로그인 메소드
+//        UserApiClient.instance.accessTokenInfo { tokenInfo, error ->
+//            if (error != null) {
+//                Toast.makeText(this, "자동 로그인 실패", Toast.LENGTH_SHORT).show()
+//            }
+//            else if (tokenInfo != null) {
+//                Toast.makeText(this, "자동 로그인 성공", Toast.LENGTH_SHORT).show()
+//                val intent = Intent(this, MainActivity::class.java)
+//                startActivity(intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
+//            }
+//        }
+
+        // SharedPreferences 안에 값이 저장되어 있을 때-> Login 패스하기
+        if (App.token_prefs.accessToken?.isNotBlank() == true){ // SharedPreferences 안에 값이 저장되어 있을 때 -> MainActivity로 이동
+            Toast.makeText(
+                this,
+                "자동 로그인 되었습니다.",
+                Toast.LENGTH_SHORT
+            ).show()
+            val intent = Intent(this, MainActivity::class.java)
+            startActivity(intent)
+            finish()
+        }
+
         val context = this
         binding.imbKakao.setOnClickListener {
             lifecycleScope.launch {
diff --git a/app/src/main/java/com/eatssu/android/ui/login/UserApiClientExt.kt b/app/src/main/java/com/eatssu/android/ui/login/UserApiClient.kt
similarity index 100%
rename from app/src/main/java/com/eatssu/android/ui/login/UserApiClientExt.kt
rename to app/src/main/java/com/eatssu/android/ui/login/UserApiClient.kt