diff --git a/src/common-module/src/main/proto/send_email_auth.proto b/src/common-module/src/main/proto/send_email_auth.proto
index e6950503..07454818 100644
--- a/src/common-module/src/main/proto/send_email_auth.proto
+++ b/src/common-module/src/main/proto/send_email_auth.proto
@@ -8,9 +8,7 @@ service GAuthService {
 }
 
 message GSendEmailAuthRequest {
-  int64 id = 1;
-  string email = 2;
-  string nickname = 3;
+  string email = 1;
 }
 
 message GSendEmailAuthResponse {
diff --git a/src/common-module/src/main/proto/update_user_auth-status.proto b/src/common-module/src/main/proto/update_user_auth-status.proto
new file mode 100644
index 00000000..2f8716d4
--- /dev/null
+++ b/src/common-module/src/main/proto/update_user_auth-status.proto
@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "org.palette.grpc";
+
+service GUserService {
+  rpc updateUserAuthStatus (GUpdateUserAuthStatusRequest) returns (GUpdateUserAuthStatusResponse) {}
+}
+
+message GUpdateUserAuthStatusRequest {
+  string email = 1;
+}
+
+message GUpdateUserAuthStatusResponse {
+  bool message = 1;
+}
diff --git a/src/user-service/build.gradle.kts b/src/user-service/build.gradle.kts
index 0df95d8a..240021ee 100644
--- a/src/user-service/build.gradle.kts
+++ b/src/user-service/build.gradle.kts
@@ -24,7 +24,7 @@ repositories {
 extra["springCloudVersion"] = "2023.0.0"
 
 dependencies {
-    implementation ("net.devh:grpc-spring-boot-starter:2.15.0.RELEASE")
+    implementation("net.devh:grpc-spring-boot-starter:2.15.0.RELEASE")
     implementation(project(":common-module"))
 
     implementation("org.springframework.boot:spring-boot-starter-web")
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/common/PasswordUtilizer.java b/src/user-service/src/main/java/org/palette/easeluserservice/common/PasswordUtilizer.java
new file mode 100644
index 00000000..a3c04ddf
--- /dev/null
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/common/PasswordUtilizer.java
@@ -0,0 +1,16 @@
+package org.palette.easeluserservice.common;
+
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+
+public class PasswordUtilizer {
+
+    private static final BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
+
+    public static String hashPassword(String password) {
+        return encoder.encode(password);
+    }
+
+    public static boolean checkPassword(String rawPassword, String encodedPassword) {
+        return encoder.matches(rawPassword, encodedPassword);
+    }
+}
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/config/ApplicationConfig.java b/src/user-service/src/main/java/org/palette/easeluserservice/config/ApplicationConfig.java
index a7cd3785..b6fa0100 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/config/ApplicationConfig.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/config/ApplicationConfig.java
@@ -1,18 +1,13 @@
 package org.palette.easeluserservice.config;
 
 import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
-import org.springframework.context.annotation.Bean;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 import org.springframework.scheduling.annotation.EnableAsync;
-import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
 
 @EnableDiscoveryClient
 @EnableJpaAuditing
 @EnableAsync
 public class ApplicationConfig {
 
-    @Bean
-    public static BCryptPasswordEncoder bCryptPasswordEncoder() {
-        return new BCryptPasswordEncoder();
-    }
+
 }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/exception/ExceptionType.java b/src/user-service/src/main/java/org/palette/easeluserservice/exception/ExceptionType.java
index 7a540dac..30f0f846 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/exception/ExceptionType.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/exception/ExceptionType.java
@@ -9,66 +9,59 @@
 public enum ExceptionType {
 
     // 400
-    USER_000001(
-            "USER_000001",
+    USER_400_000001(
+            "USER_400_000001",
             "INCORRECT_PARAMETER",
             "요청 파라미터가 올바르지 않습니다.",
             HttpStatus.BAD_REQUEST
     ),
 
     // 401
-    USER_000002(
-            "USER_000002",
+    USER_401_000001(
+            "USER_401_000001",
             "MISSED AUTHENTICATION",
             "해당 요청은 인증이 필요합니다.",
             HttpStatus.UNAUTHORIZED
     ),
 
     // 403
-    USER_000003(
-            "USER_000003",
+    USER_403_000001(
+            "USER_403_000001",
             "NOT ALLOWED PERMISSION",
             "해당 요청에 대한 권한이 없습니다.",
             HttpStatus.FORBIDDEN
     ),
 
-
     // 404
-    USER_000004(
-            "USER_000004",
+    USER_404_000001(
+            "USER_404_000001",
             "NOT FOUNDED",
             "해당 리소스가 존재하지 않습니다.",
             HttpStatus.NOT_FOUND
     ),
 
     // 405
-    USER_000005(
-            "USER_000005",
+    USER_405_000001(
+            "USER_403_000005",
             "NOT ALLOWED METHOD",
             "올바르지 않은 요청 메서드입니다.",
             HttpStatus.METHOD_NOT_ALLOWED
     ),
 
     // 409
-    USER_000006(
-            "USER_000006",
+    USER_409_000001(
+            "USER_409_000001",
             "DUPLICATED",
             "중복된 리소스가 있습니다.",
             HttpStatus.CONFLICT
     ),
 
-    USER_000007(
-            "USER_000007",
-            "BROKEN_TOKEN",
-            "요청 토큰이 올바르지 않습니다.",
-            HttpStatus.BAD_REQUEST
-    ),
-
-    USER_000008(
-            "USER_000008",
-            "EXPIRED_TOKEN",
-            "요청 토큰이 만료되었습니다.",
-            HttpStatus.FORBIDDEN
+    // 500
+    USER_500_000001(
+            "AUTH_500_000001",
+            "INTERNAL SERVER ERROR",
+            "서버 간 통신 중 예기치 못한 오류가 발생했습니다.",
+            HttpStatus.INTERNAL_SERVER_ERROR
     ),
 
     ;
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/exception/GlobalExceptionHandler.java b/src/user-service/src/main/java/org/palette/easeluserservice/exception/GlobalExceptionHandler.java
index e099c08e..ec59135e 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/exception/GlobalExceptionHandler.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/exception/GlobalExceptionHandler.java
@@ -17,7 +17,7 @@ public class GlobalExceptionHandler {
             MethodArgumentTypeMismatchException.class,
     })
     public ResponseEntity<ExceptionResponse> handleRequestValidationException(Exception e) {
-        ExceptionType exceptionType = ExceptionType.USER_000001;
+        ExceptionType exceptionType = ExceptionType.USER_404_000001;
         ExceptionResponse exceptionResponse = ExceptionResponse.builder()
                 .code(exceptionType.getCode())
                 .message(exceptionType.getMessage())
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuth.java b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuthClient.java
similarity index 57%
rename from src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuth.java
rename to src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuthClient.java
index d539b54c..796783a8 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuth.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcAuthClient.java
@@ -1,34 +1,29 @@
 package org.palette.easeluserservice.external;
 
 import io.grpc.StatusRuntimeException;
-import lombok.RequiredArgsConstructor;
 import net.devh.boot.grpc.client.inject.GrpcClient;
+import org.palette.easeluserservice.exception.BaseException;
+import org.palette.easeluserservice.exception.ExceptionType;
 import org.palette.easeluserservice.persistence.User;
 import org.palette.grpc.GAuthServiceGrpc;
 import org.palette.grpc.GSendEmailAuthRequest;
-import org.palette.grpc.GSendEmailAuthResponse;
 import org.springframework.stereotype.Component;
 
 @Component
-@RequiredArgsConstructor
-public class GrpcAuth {
+public class GrpcAuthClient {
 
     @GrpcClient("auth-service")
     private GAuthServiceGrpc.GAuthServiceBlockingStub gAuthServiceBlockingStub;
 
-    public GSendEmailAuthResponse sendEmailAuth(User user) {
-        // TODO: 매개변수 및 반환값 변경, 예외처리
+    public void sendEmailAuth(User user) {
         try {
-            return gAuthServiceBlockingStub.sendEmailAuth(
+            gAuthServiceBlockingStub.sendEmailAuth(
                     GSendEmailAuthRequest.newBuilder()
-                            .setId(user.getId())
                             .setEmail(user.getEmail())
-                            .setNickname(user.getProfile().nickname())
                             .build()
             );
         } catch (final StatusRuntimeException e) {
-            System.out.println(e.getMessage());
-            return null;
+            throw new BaseException(ExceptionType.USER_500_000001);
         }
     }
 }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcServerByAuthService.java b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcServerByAuthService.java
new file mode 100644
index 00000000..d6522cd9
--- /dev/null
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcServerByAuthService.java
@@ -0,0 +1,35 @@
+package org.palette.easeluserservice.external;
+
+import io.grpc.stub.StreamObserver;
+import lombok.RequiredArgsConstructor;
+import net.devh.boot.grpc.server.service.GrpcService;
+import org.palette.easeluserservice.persistence.User;
+import org.palette.easeluserservice.service.UserService;
+import org.palette.grpc.GUpdateUserAuthStatusRequest;
+import org.palette.grpc.GUpdateUserAuthStatusResponse;
+import org.palette.grpc.GUserServiceGrpc;
+import org.springframework.transaction.annotation.Transactional;
+
+@GrpcService
+@RequiredArgsConstructor
+public class GrpcServerByAuthService extends GUserServiceGrpc.GUserServiceImplBase {
+
+    private final UserService userService;
+
+    @Transactional
+    @Override
+    public void updateUserAuthStatus(
+            GUpdateUserAuthStatusRequest request,
+            StreamObserver<GUpdateUserAuthStatusResponse> responseObserver
+    ) {
+        User user = userService.loadByEmail(request.getEmail());
+
+        userService.updateUserAuthStatus(user);
+
+        GUpdateUserAuthStatusResponse response = GUpdateUserAuthStatusResponse.newBuilder()
+                .setMessage(true)
+                .build();
+        responseObserver.onNext(response);
+        responseObserver.onCompleted();
+    }
+}
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocial.java b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocialClient.java
similarity index 83%
rename from src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocial.java
rename to src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocialClient.java
index 4977b5ba..7e7ba6c8 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocial.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/external/GrpcSocialClient.java
@@ -2,6 +2,8 @@
 
 import io.grpc.StatusRuntimeException;
 import net.devh.boot.grpc.client.inject.GrpcClient;
+import org.palette.easeluserservice.exception.BaseException;
+import org.palette.easeluserservice.exception.ExceptionType;
 import org.palette.easeluserservice.persistence.User;
 import org.palette.grpc.GCreateUserRequest;
 import org.palette.grpc.GCreateUserResponse;
@@ -9,13 +11,12 @@
 import org.springframework.stereotype.Component;
 
 @Component
-public class GrpcSocial {
+public class GrpcSocialClient {
 
     @GrpcClient("social-service")
     private GSocialServiceGrpc.GSocialServiceBlockingStub gSocialServiceBlockingStub;
 
     public GCreateUserResponse createSocialUser(User user) {
-        // TODO: 매개변수 및 반환값 변경, 예외처리
         try {
             return gSocialServiceBlockingStub.createUser(
                     GCreateUserRequest.newBuilder()
@@ -26,8 +27,7 @@ public GCreateUserResponse createSocialUser(User user) {
                             .setIsActive(user.getIsActivated())
                             .build());
         } catch (final StatusRuntimeException e) {
-            System.out.println(e.getMessage());
-            return null;
+            throw new BaseException(ExceptionType.USER_500_000001);
         }
     }
 }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/persistence/User.java b/src/user-service/src/main/java/org/palette/easeluserservice/persistence/User.java
index 20d058af..ba78ced2 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/persistence/User.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/persistence/User.java
@@ -65,6 +65,10 @@ public class User {
     @Column(name = "deleted_at")
     private LocalDateTime deletedAt = null;
 
+    public void updateToAuthed() {
+        this.authed = true;
+    }
+
     public Boolean isUserNotAuthed() {
         return !this.getAuthed();
     }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/persistence/embed/Password.java b/src/user-service/src/main/java/org/palette/easeluserservice/persistence/embed/Password.java
index ddd5de21..0c7405d8 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/persistence/embed/Password.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/persistence/embed/Password.java
@@ -2,8 +2,7 @@
 
 import jakarta.persistence.Column;
 import jakarta.persistence.Embeddable;
-
-import static org.palette.easeluserservice.config.ApplicationConfig.bCryptPasswordEncoder;
+import org.palette.easeluserservice.common.PasswordUtilizer;
 
 @Embeddable
 public record Password(
@@ -11,6 +10,6 @@ public record Password(
         String value
 ) {
     public Password(String value) {
-        this.value = bCryptPasswordEncoder().encode(value);
+        this.value = PasswordUtilizer.hashPassword(value);
     }
 }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/service/UserService.java b/src/user-service/src/main/java/org/palette/easeluserservice/service/UserService.java
index 58609f13..f0b38603 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/service/UserService.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/service/UserService.java
@@ -66,15 +66,25 @@ public User createCompletedUser(
         return user;
     }
 
+    public void updateUserAuthStatus(User user) {
+        user.updateToAuthed();
+    }
+
     public void isEmailAlreadyExists(String requestedEmail) {
-        if (userJpaRepository.existsByEmail(requestedEmail)) throw new BaseException(ExceptionType.USER_000006);
+        if (userJpaRepository.existsByEmail(requestedEmail)) {
+            throw new BaseException(ExceptionType.USER_409_000001);
+        }
     }
 
     public void isUsernameAlreadyExists(String requestedUsername) {
-        if (userJpaRepository.existsByUsername(requestedUsername)) throw new BaseException(ExceptionType.USER_000006);
+        if (userJpaRepository.existsByUsername(requestedUsername)) {
+            throw new BaseException(ExceptionType.USER_409_000001);
+        }
     }
 
-    public Optional<User> loadByEmail(String email) {
-        return userJpaRepository.findByEmail(email);
+    public User loadByEmail(String email) {
+        return userJpaRepository.findByEmail(email).orElseThrow(() ->
+                new BaseException(ExceptionType.USER_404_000001)
+        );
     }
 }
diff --git a/src/user-service/src/main/java/org/palette/easeluserservice/usecase/UserUsecase.java b/src/user-service/src/main/java/org/palette/easeluserservice/usecase/UserUsecase.java
index e5360990..26555d03 100644
--- a/src/user-service/src/main/java/org/palette/easeluserservice/usecase/UserUsecase.java
+++ b/src/user-service/src/main/java/org/palette/easeluserservice/usecase/UserUsecase.java
@@ -6,23 +6,21 @@
 import org.palette.easeluserservice.dto.response.EmailDuplicationVerifyResponse;
 import org.palette.easeluserservice.exception.BaseException;
 import org.palette.easeluserservice.exception.ExceptionType;
-import org.palette.easeluserservice.external.GrpcAuth;
-import org.palette.easeluserservice.external.GrpcSocial;
+import org.palette.easeluserservice.external.GrpcAuthClient;
+import org.palette.easeluserservice.external.GrpcSocialClient;
 import org.palette.easeluserservice.persistence.User;
 import org.palette.easeluserservice.service.UserService;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.util.Optional;
-
 @RequiredArgsConstructor
 @Service
 @Transactional(readOnly = true)
 public class UserUsecase {
 
     private final UserService userService;
-    private final GrpcSocial gRPCSocial;
-    private final GrpcAuth gRPCAuth;
+    private final GrpcSocialClient gRPCSocialClient;
+    private final GrpcAuthClient gRPCAuthClient;
 
     public EmailDuplicationVerifyResponse executeNicknameDuplicationVerify(
             String email
@@ -42,18 +40,15 @@ public void executeTemporaryJoin(
                 temporaryJoinRequest.nickname()
         );
 
-//        gRPCSendEmailAuth(user);
+        gRPCAuthClient.sendEmailAuth(user);
     }
 
     @Transactional
     public void executeJoin(
             JoinRequest joinRequest
     ) {
-        final Optional<User> optionalUser = userService.loadByEmail(
-                joinRequest.email()
-        );
-
-        User user = validateJoinRequest(joinRequest, optionalUser);
+        User user = userService.loadByEmail(joinRequest.email());
+        validateJoinRequest(joinRequest, user);
 
         user = userService.createCompletedUser(
                 user,
@@ -65,22 +60,13 @@ public void executeJoin(
                 joinRequest.websitePath()
         );
 
-        gRPCCreateSocialUser(user);
-    }
-
-    private void gRPCSendEmailAuth(User user) {
-        gRPCAuth.sendEmailAuth(user);
-    }
-
-    private void gRPCCreateSocialUser(User user) {
-        gRPCSocial.createSocialUser(user);
+        gRPCSocialClient.createSocialUser(user);
     }
 
-    private User validateJoinRequest(JoinRequest joinRequest, Optional<User> optionalUser) {
-        if (optionalUser.isEmpty()) throw new BaseException(ExceptionType.USER_000004);
-        User user = optionalUser.get();
-        if (user.isUserNotAuthed()) throw new BaseException(ExceptionType.USER_000002);
+    private void validateJoinRequest(JoinRequest joinRequest, User user) {
+        if (user.isUserNotAuthed()) {
+            throw new BaseException(ExceptionType.USER_401_000001);
+        }
         userService.isUsernameAlreadyExists(joinRequest.username());
-        return user;
     }
 }
diff --git a/src/user-service/src/main/resources/application.yml b/src/user-service/src/main/resources/application.yml
index bb7eb895..cd9eb8ca 100644
--- a/src/user-service/src/main/resources/application.yml
+++ b/src/user-service/src/main/resources/application.yml
@@ -1,5 +1,5 @@
 server:
-  port: 10002
+  port: 10003
 
 spring:
   application:
@@ -26,14 +26,19 @@ eureka:
     fetch-registry: true
     register-with-eureka: true
     service-url:
-      defaultZone: http://localhost:8761/eureka
+      defaultZone: http://host.docker.internal:8761/eureka
 
 grpc:
   server:
-    port: 11002
+    port: 11003
   client:
     social-service:
       address: 'discovery:///SOCIAL-SERVICE'
       enableKeepAlive: true
       keepAliveWithoutCalls: true
       negotiationType: plaintext
+    auth-service:
+      address: 'discovery:///AUTH-SERVICE'
+      enableKeepAlive: true
+      keepAliveWithoutCalls: true
+      negotiationType: plaintext
diff --git a/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/Join.java b/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/Join.java
index 67af3dcd..7700d4b9 100644
--- a/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/Join.java
+++ b/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/Join.java
@@ -82,7 +82,6 @@ public void insertTemporaryUser() throws NoSuchMethodException,
     @Test
     @DisplayName("회원가입 정상 로직 테스트")
     void executePassCase() throws Exception {
-        System.out.println("userJpaRepository.findByEmail(\"diger@gmail.com\") = " + userJpaRepository.findByEmail("diger@gmail.com"));
         JoinRequest joinRequest = new JoinRequest(
                 "diger@gmail.com",
                 "digerPassword",
diff --git a/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/TemporaryJoin.java b/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/TemporaryJoin.java
index 72023810..68bc6d1a 100644
--- a/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/TemporaryJoin.java
+++ b/src/user-service/src/test/java/org/palette/easeluserservice/e2e/api/TemporaryJoin.java
@@ -7,13 +7,13 @@
 
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
-public class TemporaryJoin extends AcceptanceTestBase {
+class TemporaryJoin extends AcceptanceTestBase {
 
     @Test
     @DisplayName("임시 회원가입 정상 로직 테스트")
-    public void executePassCase() throws Exception {
+    void executePassCase() throws Exception {
         TemporaryJoinRequest temporaryJoinRequest = new TemporaryJoinRequest(
-                "diger@gmail.com",
+                "kitten.diger@gmail.com",
                 "digerDisplayName"
         );
         executePost(