diff --git a/src/main/java/com/example/solidconnection/auth/controller/AuthController.java b/src/main/java/com/example/solidconnection/auth/controller/AuthController.java
index 9308a6872..1f68be171 100644
--- a/src/main/java/com/example/solidconnection/auth/controller/AuthController.java
+++ b/src/main/java/com/example/solidconnection/auth/controller/AuthController.java
@@ -5,10 +5,11 @@
 import com.example.solidconnection.auth.dto.EmailSignUpTokenResponse;
 import com.example.solidconnection.auth.dto.ReissueResponse;
 import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.auth.dto.SignUpRequest;
 import com.example.solidconnection.auth.dto.oauth.OAuthCodeRequest;
 import com.example.solidconnection.auth.dto.oauth.OAuthResponse;
-import com.example.solidconnection.auth.dto.oauth.OAuthSignInResponse;
+import com.example.solidconnection.auth.dto.oauth.OAuthResult;
 import com.example.solidconnection.auth.service.AuthService;
 import com.example.solidconnection.auth.service.oauth.OAuthService;
 import com.example.solidconnection.auth.service.signin.EmailSignInService;
@@ -47,11 +48,9 @@ public ResponseEntity<OAuthResponse> processAppleOAuth(
             @Valid @RequestBody OAuthCodeRequest oAuthCodeRequest,
             HttpServletResponse httpServletResponse
     ) {
-        OAuthResponse oAuthResponse = oAuthService.processOAuth(AuthType.APPLE, oAuthCodeRequest);
-        if (oAuthResponse instanceof OAuthSignInResponse signInResponse) {
-            refreshTokenCookieManager.setCookie(httpServletResponse, signInResponse.refreshToken());
-        }
-        return ResponseEntity.ok(oAuthResponse);
+        OAuthResult oAuthResult = oAuthService.processOAuth(AuthType.APPLE, oAuthCodeRequest);
+        setRefreshTokenCookie(httpServletResponse, oAuthResult.refreshToken());
+        return ResponseEntity.ok(oAuthResult.response());
     }
 
     @PostMapping("/kakao")
@@ -59,11 +58,9 @@ public ResponseEntity<OAuthResponse> processKakaoOAuth(
             @Valid @RequestBody OAuthCodeRequest oAuthCodeRequest,
             HttpServletResponse httpServletResponse
     ) {
-        OAuthResponse oAuthResponse = oAuthService.processOAuth(AuthType.KAKAO, oAuthCodeRequest);
-        if (oAuthResponse instanceof OAuthSignInResponse signInResponse) {
-            refreshTokenCookieManager.setCookie(httpServletResponse, signInResponse.refreshToken());
-        }
-        return ResponseEntity.ok(oAuthResponse);
+        OAuthResult oAuthResult = oAuthService.processOAuth(AuthType.KAKAO, oAuthCodeRequest);
+        setRefreshTokenCookie(httpServletResponse, oAuthResult.refreshToken());
+        return ResponseEntity.ok(oAuthResult.response());
     }
 
     @PostMapping("/email/sign-in")
@@ -71,9 +68,9 @@ public ResponseEntity<SignInResponse> signInWithEmail(
             @Valid @RequestBody EmailSignInRequest signInRequest,
             HttpServletResponse httpServletResponse
     ) {
-        SignInResponse signInResponse = emailSignInService.signIn(signInRequest);
-        refreshTokenCookieManager.setCookie(httpServletResponse, signInResponse.refreshToken());
-        return ResponseEntity.ok(signInResponse);
+        SignInResult signInResult = emailSignInService.signIn(signInRequest);
+        refreshTokenCookieManager.setCookie(httpServletResponse, signInResult.refreshToken());
+        return ResponseEntity.ok(SignInResponse.from(signInResult));
     }
 
     /* 이메일 회원가입 시 signUpToken 을 발급받기 위한 api */
@@ -87,10 +84,12 @@ public ResponseEntity<EmailSignUpTokenResponse> signUpWithEmail(
 
     @PostMapping("/sign-up")
     public ResponseEntity<SignInResponse> signUp(
-            @Valid @RequestBody SignUpRequest signUpRequest
+            @Valid @RequestBody SignUpRequest signUpRequest,
+            HttpServletResponse httpServletResponse
     ) {
-        SignInResponse signInResponse = signUpService.signUp(signUpRequest);
-        return ResponseEntity.ok(signInResponse);
+        SignInResult signInResult = signUpService.signUp(signUpRequest);
+        refreshTokenCookieManager.setCookie(httpServletResponse, signInResult.refreshToken());
+        return ResponseEntity.ok(SignInResponse.from(signInResult));
     }
 
     @PostMapping("/sign-out")
@@ -123,6 +122,12 @@ public ResponseEntity<ReissueResponse> reissueToken(HttpServletRequest request)
         return ResponseEntity.ok(reissueResponse);
     }
 
+    private void setRefreshTokenCookie(HttpServletResponse httpServletResponse, String refreshToken) {
+        if (refreshToken != null) {
+            refreshTokenCookieManager.setCookie(httpServletResponse, refreshToken);
+        }
+    }
+
     private String getAccessToken(Authentication authentication) {
         if (authentication == null || !(authentication.getCredentials() instanceof String accessToken)) {
             throw new CustomException(ErrorCode.AUTHENTICATION_FAILED, "엑세스 토큰이 없습니다.");
diff --git a/src/main/java/com/example/solidconnection/auth/dto/SignInResponse.java b/src/main/java/com/example/solidconnection/auth/dto/SignInResponse.java
index ac9d39290..05c8563a5 100644
--- a/src/main/java/com/example/solidconnection/auth/dto/SignInResponse.java
+++ b/src/main/java/com/example/solidconnection/auth/dto/SignInResponse.java
@@ -1,14 +1,10 @@
 package com.example.solidconnection.auth.dto;
 
-import com.example.solidconnection.auth.domain.AccessToken;
-import com.example.solidconnection.auth.domain.RefreshToken;
-
 public record SignInResponse(
-        String accessToken,
-        String refreshToken
+        String accessToken
 ) {
 
-    public static SignInResponse of(AccessToken accessToken, RefreshToken refreshToken) {
-        return new SignInResponse(accessToken.token(), refreshToken.token());
+    public static SignInResponse from(SignInResult signInResult) {
+        return new SignInResponse(signInResult.accessToken());
     }
 }
diff --git a/src/main/java/com/example/solidconnection/auth/dto/SignInResult.java b/src/main/java/com/example/solidconnection/auth/dto/SignInResult.java
new file mode 100644
index 000000000..78f0f002a
--- /dev/null
+++ b/src/main/java/com/example/solidconnection/auth/dto/SignInResult.java
@@ -0,0 +1,14 @@
+package com.example.solidconnection.auth.dto;
+
+import com.example.solidconnection.auth.domain.AccessToken;
+import com.example.solidconnection.auth.domain.RefreshToken;
+
+public record SignInResult(
+        String accessToken,
+        String refreshToken
+) {
+
+    public static SignInResult of(AccessToken accessToken, RefreshToken refreshToken) {
+        return new SignInResult(accessToken.token(), refreshToken.token());
+    }
+}
diff --git a/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthResult.java b/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthResult.java
new file mode 100644
index 000000000..ee152f9f3
--- /dev/null
+++ b/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthResult.java
@@ -0,0 +1,8 @@
+package com.example.solidconnection.auth.dto.oauth;
+
+public record OAuthResult(
+        OAuthResponse response,
+        String refreshToken
+) {
+
+}
diff --git a/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthSignInResponse.java b/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthSignInResponse.java
index 6ac121c46..9e9f75851 100644
--- a/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthSignInResponse.java
+++ b/src/main/java/com/example/solidconnection/auth/dto/oauth/OAuthSignInResponse.java
@@ -1,8 +1,11 @@
 package com.example.solidconnection.auth.dto.oauth;
 
+import com.example.solidconnection.auth.dto.SignInResult;
+
 public record OAuthSignInResponse(
-        boolean isRegistered,
-        String accessToken,
-        String refreshToken) implements OAuthResponse {
+        String accessToken) implements OAuthResponse {
 
+    public static OAuthSignInResponse from(SignInResult signInResult) {
+        return new OAuthSignInResponse(signInResult.accessToken());
+    }
 }
diff --git a/src/main/java/com/example/solidconnection/auth/dto/oauth/SignUpPrepareResponse.java b/src/main/java/com/example/solidconnection/auth/dto/oauth/SignUpPrepareResponse.java
index 5a6c60c57..663b8906a 100644
--- a/src/main/java/com/example/solidconnection/auth/dto/oauth/SignUpPrepareResponse.java
+++ b/src/main/java/com/example/solidconnection/auth/dto/oauth/SignUpPrepareResponse.java
@@ -1,7 +1,6 @@
 package com.example.solidconnection.auth.dto.oauth;
 
 public record SignUpPrepareResponse(
-        boolean isRegistered,
         String nickname,
         String email,
         String profileImageUrl,
@@ -9,7 +8,6 @@ public record SignUpPrepareResponse(
 
     public static SignUpPrepareResponse of(OAuthUserInfoDto oAuthUserInfoDto, String signUpToken) {
         return new SignUpPrepareResponse(
-                false,
                 oAuthUserInfoDto.getNickname(),
                 oAuthUserInfoDto.getEmail(),
                 oAuthUserInfoDto.getProfileImageUrl(),
diff --git a/src/main/java/com/example/solidconnection/auth/service/oauth/OAuthService.java b/src/main/java/com/example/solidconnection/auth/service/oauth/OAuthService.java
index 08ab0c0b7..6f8e65d3b 100644
--- a/src/main/java/com/example/solidconnection/auth/service/oauth/OAuthService.java
+++ b/src/main/java/com/example/solidconnection/auth/service/oauth/OAuthService.java
@@ -1,9 +1,9 @@
 package com.example.solidconnection.auth.service.oauth;
 
 import com.example.solidconnection.auth.domain.SignUpToken;
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.auth.dto.oauth.OAuthCodeRequest;
-import com.example.solidconnection.auth.dto.oauth.OAuthResponse;
+import com.example.solidconnection.auth.dto.oauth.OAuthResult;
 import com.example.solidconnection.auth.dto.oauth.OAuthSignInResponse;
 import com.example.solidconnection.auth.dto.oauth.OAuthUserInfoDto;
 import com.example.solidconnection.auth.dto.oauth.SignUpPrepareResponse;
@@ -32,26 +32,26 @@ public class OAuthService {
     private final OAuthClientMap oauthClientMap;
 
     @Transactional
-    public OAuthResponse processOAuth(AuthType authType, OAuthCodeRequest codeRequest) {
+    public OAuthResult processOAuth(AuthType authType, OAuthCodeRequest codeRequest) {
         OAuthClient oauthClient = oauthClientMap.getOAuthClient(authType);
         OAuthUserInfoDto userInfo = oauthClient.getUserInfo(codeRequest.code());
         Optional<SiteUser> optionalSiteUser = siteUserRepository.findByEmailAndAuthType(userInfo.getEmail(), authType);
 
         if (optionalSiteUser.isPresent()) {
             SiteUser siteUser = optionalSiteUser.get();
-            return getSignInResponse(siteUser);
+            return getSignInResult(siteUser);
         }
 
-        return getSignUpPrepareResponse(userInfo, authType);
+        return getSignUpPrepareResult(userInfo, authType);
     }
 
-    private OAuthSignInResponse getSignInResponse(SiteUser siteUser) {
-        SignInResponse signInResponse = signInService.signIn(siteUser);
-        return new OAuthSignInResponse(true, signInResponse.accessToken(), signInResponse.refreshToken());
+    private OAuthResult getSignInResult(SiteUser siteUser) {
+        SignInResult signInResult = signInService.signIn(siteUser);
+        return new OAuthResult(OAuthSignInResponse.from(signInResult), signInResult.refreshToken());
     }
 
-    private SignUpPrepareResponse getSignUpPrepareResponse(OAuthUserInfoDto userInfoDto, AuthType authType) {
+    private OAuthResult getSignUpPrepareResult(OAuthUserInfoDto userInfoDto, AuthType authType) {
         SignUpToken signUpToken = signUpTokenProvider.generateAndSaveSignUpToken(userInfoDto.getEmail(), authType);
-        return SignUpPrepareResponse.of(userInfoDto, signUpToken.token());
+        return new OAuthResult(SignUpPrepareResponse.of(userInfoDto, signUpToken.token()), null);
     }
 }
diff --git a/src/main/java/com/example/solidconnection/auth/service/signin/EmailSignInService.java b/src/main/java/com/example/solidconnection/auth/service/signin/EmailSignInService.java
index 29f379a22..0eda2e5b2 100644
--- a/src/main/java/com/example/solidconnection/auth/service/signin/EmailSignInService.java
+++ b/src/main/java/com/example/solidconnection/auth/service/signin/EmailSignInService.java
@@ -3,7 +3,7 @@
 import static com.example.solidconnection.common.exception.ErrorCode.SIGN_IN_FAILED;
 
 import com.example.solidconnection.auth.dto.EmailSignInRequest;
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.common.exception.CustomException;
 import com.example.solidconnection.siteuser.domain.AuthType;
 import com.example.solidconnection.siteuser.domain.SiteUser;
@@ -22,7 +22,7 @@ public class EmailSignInService {
     private final PasswordEncoder passwordEncoder;
 
     @Transactional(readOnly = true)
-    public SignInResponse signIn(EmailSignInRequest signInRequest) {
+    public SignInResult signIn(EmailSignInRequest signInRequest) {
         SiteUser siteUser = getEmailMatchingUserOrThrow(signInRequest.email());
         validatePassword(signInRequest.password(), siteUser.getPassword());
         return signInService.signIn(siteUser);
diff --git a/src/main/java/com/example/solidconnection/auth/service/signin/SignInService.java b/src/main/java/com/example/solidconnection/auth/service/signin/SignInService.java
index ee63a02c3..e4be77a3c 100644
--- a/src/main/java/com/example/solidconnection/auth/service/signin/SignInService.java
+++ b/src/main/java/com/example/solidconnection/auth/service/signin/SignInService.java
@@ -2,7 +2,7 @@
 
 import com.example.solidconnection.auth.domain.AccessToken;
 import com.example.solidconnection.auth.domain.RefreshToken;
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.auth.service.AuthTokenProvider;
 import com.example.solidconnection.siteuser.domain.SiteUser;
 import lombok.RequiredArgsConstructor;
@@ -16,11 +16,11 @@ public class SignInService {
     private final AuthTokenProvider authTokenProvider;
 
     @Transactional
-    public SignInResponse signIn(SiteUser siteUser) {
+    public SignInResult signIn(SiteUser siteUser) {
         resetQuitedAt(siteUser);
         AccessToken accessToken = authTokenProvider.generateAccessToken(siteUser);
         RefreshToken refreshToken = authTokenProvider.generateAndSaveRefreshToken(siteUser);
-        return SignInResponse.of(accessToken, refreshToken);
+        return SignInResult.of(accessToken, refreshToken);
     }
 
     private void resetQuitedAt(SiteUser siteUser) {
diff --git a/src/main/java/com/example/solidconnection/auth/service/signup/SignUpService.java b/src/main/java/com/example/solidconnection/auth/service/signup/SignUpService.java
index 8f814be4a..72a419beb 100644
--- a/src/main/java/com/example/solidconnection/auth/service/signup/SignUpService.java
+++ b/src/main/java/com/example/solidconnection/auth/service/signup/SignUpService.java
@@ -4,7 +4,7 @@
 import static com.example.solidconnection.common.exception.ErrorCode.SIGN_UP_TOKEN_INVALID;
 import static com.example.solidconnection.common.exception.ErrorCode.USER_ALREADY_EXISTED;
 
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.auth.dto.SignUpRequest;
 import com.example.solidconnection.auth.service.signin.SignInService;
 import com.example.solidconnection.common.exception.CustomException;
@@ -38,7 +38,7 @@ public class SignUpService {
     private final PasswordTemporaryStorage passwordTemporaryStorage;
 
     @Transactional
-    public SignInResponse signUp(SignUpRequest signUpRequest) {
+    public SignInResult signUp(SignUpRequest signUpRequest) {
         // 검증
         signUpTokenProvider.validateSignUpToken(signUpRequest.signUpToken());
         String email = signUpTokenProvider.parseEmail(signUpRequest.signUpToken());
@@ -66,7 +66,7 @@ public SignInResponse signUp(SignUpRequest signUpRequest) {
         interestedCountryService.saveInterestedCountry(siteUser, signUpRequest.interestedCountries());
 
         // 로그인
-        SignInResponse response = signInService.signIn(siteUser);
+        SignInResult response = signInService.signIn(siteUser);
 
         // 회원가입을 위해 저장한 데이터(SignUpToken, 비밀번호) 삭제
         clearSignUpData(email, authType);
diff --git a/src/test/java/com/example/solidconnection/auth/service/oauth/OAuthServiceTest.java b/src/test/java/com/example/solidconnection/auth/service/oauth/OAuthServiceTest.java
index 427701399..49d11a340 100644
--- a/src/test/java/com/example/solidconnection/auth/service/oauth/OAuthServiceTest.java
+++ b/src/test/java/com/example/solidconnection/auth/service/oauth/OAuthServiceTest.java
@@ -7,6 +7,7 @@
 
 import com.example.solidconnection.auth.dto.oauth.OAuthCodeRequest;
 import com.example.solidconnection.auth.dto.oauth.OAuthResponse;
+import com.example.solidconnection.auth.dto.oauth.OAuthResult;
 import com.example.solidconnection.auth.dto.oauth.OAuthSignInResponse;
 import com.example.solidconnection.auth.dto.oauth.OAuthUserInfoDto;
 import com.example.solidconnection.auth.dto.oauth.SignUpPrepareResponse;
@@ -57,32 +58,33 @@ void setUp() { // 실제 client 호출하지 않도록 mocking
         siteUserFixture.사용자(email, authType);
 
         // when
-        OAuthResponse response = oAuthService.processOAuth(authType, new OAuthCodeRequest(oauthCode));
+        OAuthResult oAuthResult = oAuthService.processOAuth(authType, new OAuthCodeRequest(oauthCode));
 
         // then
+        OAuthResponse response = oAuthResult.response();
         assertThat(response).isInstanceOf(OAuthSignInResponse.class);
         OAuthSignInResponse signInResponse = (OAuthSignInResponse) response;
         assertAll(
-                () -> assertThat(signInResponse.isRegistered()).isTrue(),
                 () -> assertThat(signInResponse.accessToken()).isNotBlank(),
-                () -> assertThat(signInResponse.refreshToken()).isNotBlank()
+                () -> assertThat(oAuthResult.refreshToken()).isNotBlank()
         );
     }
 
     @Test
     void 신규_회원이라면_회원가입에_필요한_정보를_응답한다() {
         // when
-        OAuthResponse response = oAuthService.processOAuth(authType, new OAuthCodeRequest(oauthCode));
+        OAuthResult oAuthResult = oAuthService.processOAuth(authType, new OAuthCodeRequest(oauthCode));
 
         // then
+        OAuthResponse response = oAuthResult.response();
         assertThat(response).isInstanceOf(SignUpPrepareResponse.class);
         SignUpPrepareResponse signUpPrepareResponse = (SignUpPrepareResponse) response;
         assertAll(
-                () -> assertThat(signUpPrepareResponse.isRegistered()).isFalse(),
                 () -> assertThat(signUpPrepareResponse.signUpToken()).isNotBlank(),
                 () -> assertThat(signUpPrepareResponse.email()).isEqualTo(email),
                 () -> assertThat(signUpPrepareResponse.profileImageUrl()).isEqualTo(profileImageUrl),
-                () -> assertThat(signUpPrepareResponse.nickname()).isEqualTo(nickname)
+                () -> assertThat(signUpPrepareResponse.nickname()).isEqualTo(nickname),
+                () -> assertThat(oAuthResult.refreshToken()).isNull()
         );
     }
 }
diff --git a/src/test/java/com/example/solidconnection/auth/service/signin/EmailSignInServiceTest.java b/src/test/java/com/example/solidconnection/auth/service/signin/EmailSignInServiceTest.java
index 46c6d565a..f52cb9e3f 100644
--- a/src/test/java/com/example/solidconnection/auth/service/signin/EmailSignInServiceTest.java
+++ b/src/test/java/com/example/solidconnection/auth/service/signin/EmailSignInServiceTest.java
@@ -4,7 +4,7 @@
 import static org.junit.jupiter.api.Assertions.assertAll;
 
 import com.example.solidconnection.auth.dto.EmailSignInRequest;
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.common.exception.CustomException;
 import com.example.solidconnection.common.exception.ErrorCode;
 import com.example.solidconnection.siteuser.domain.SiteUser;
@@ -35,12 +35,12 @@ class EmailSignInServiceTest {
         EmailSignInRequest signInRequest = new EmailSignInRequest(user.getEmail(), rawPassword);
 
         // when
-        SignInResponse signInResponse = emailSignInService.signIn(signInRequest);
+        SignInResult signInResult = emailSignInService.signIn(signInRequest);
 
         // then
         assertAll(
-                () -> Assertions.assertThat(signInResponse.accessToken()).isNotNull(),
-                () -> Assertions.assertThat(signInResponse.refreshToken()).isNotNull()
+                () -> Assertions.assertThat(signInResult.accessToken()).isNotNull(),
+                () -> Assertions.assertThat(signInResult.refreshToken()).isNotNull()
         );
     }
 
diff --git a/src/test/java/com/example/solidconnection/auth/service/signin/SignInServiceTest.java b/src/test/java/com/example/solidconnection/auth/service/signin/SignInServiceTest.java
index 957c5c3a1..7e90de257 100644
--- a/src/test/java/com/example/solidconnection/auth/service/signin/SignInServiceTest.java
+++ b/src/test/java/com/example/solidconnection/auth/service/signin/SignInServiceTest.java
@@ -5,7 +5,7 @@
 
 import com.example.solidconnection.auth.domain.RefreshToken;
 import com.example.solidconnection.auth.domain.Subject;
-import com.example.solidconnection.auth.dto.SignInResponse;
+import com.example.solidconnection.auth.dto.SignInResult;
 import com.example.solidconnection.auth.service.TokenProvider;
 import com.example.solidconnection.auth.service.TokenStorage;
 import com.example.solidconnection.siteuser.domain.SiteUser;
@@ -46,16 +46,16 @@ void setUp() {
     @Test
     void 성공적으로_로그인한다() {
         // when
-        SignInResponse signInResponse = signInService.signIn(user);
+        SignInResult signInResult = signInService.signIn(user);
 
         // then
-        Subject accessTokenSubject = tokenProvider.parseSubject(signInResponse.accessToken());
-        Subject refreshTokenSubject = tokenProvider.parseSubject(signInResponse.refreshToken());
+        Subject accessTokenSubject = tokenProvider.parseSubject(signInResult.accessToken());
+        Subject refreshTokenSubject = tokenProvider.parseSubject(signInResult.refreshToken());
         Optional<String> savedRefreshToken = tokenStorage.findToken(subject, RefreshToken.class);
         assertAll(
                 () -> assertThat(accessTokenSubject).isEqualTo(subject),
                 () -> assertThat(refreshTokenSubject).isEqualTo(subject),
-                () -> assertThat(savedRefreshToken).hasValue(signInResponse.refreshToken()));
+                () -> assertThat(savedRefreshToken).hasValue(signInResult.refreshToken()));
     }
 
     @Test