diff --git a/src/main/java/com/umc/naoman/global/security/repository/OAuth2AuthorizationRequestBasedOnCookieRepository.java b/src/main/java/com/umc/naoman/global/security/repository/OAuth2AuthorizationRequestBasedOnCookieRepository.java
index f4e7c5c..93b4da9 100644
--- a/src/main/java/com/umc/naoman/global/security/repository/OAuth2AuthorizationRequestBasedOnCookieRepository.java
+++ b/src/main/java/com/umc/naoman/global/security/repository/OAuth2AuthorizationRequestBasedOnCookieRepository.java
@@ -4,11 +4,13 @@
 import jakarta.servlet.http.Cookie;
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.oauth2.client.web.AuthorizationRequestRepository;
 import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationRequest;
 import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
 import org.springframework.web.util.WebUtils;
 
+@Slf4j
 public class OAuth2AuthorizationRequestBasedOnCookieRepository
         implements AuthorizationRequestRepository<OAuth2AuthorizationRequest> {
     public final static String OAUTH2_AUTHORIZATION_REQUEST_COOKIE_NAME = "OAuth2_AUTHORIZATION_REQUEST";
@@ -18,6 +20,7 @@ public class OAuth2AuthorizationRequestBasedOnCookieRepository
     public OAuth2AuthorizationRequest loadAuthorizationRequest(HttpServletRequest request) {
         String stateParameter = request.getParameter(OAuth2ParameterNames.STATE);
         if (stateParameter == null) {
+            log.debug("loadAuthorizationRequest() - state 파라미터 부재");
             return null;
         }
 
@@ -29,9 +32,11 @@ public OAuth2AuthorizationRequest loadAuthorizationRequest(HttpServletRequest re
             if (stateParameter.equals(authorizationRequest.getState())) {
                 return authorizationRequest;
             } else {
+                log.debug("loadAuthorizationRequest() - state 파라미터 불일치");
                 return null;
             }
         } else {
+            log.debug("loadAuthorizationRequest() - OAuth2_AUTHORIZATION_REQUEST 키의 쿠키 존재하지 않음");
             return null;
         }
     }
@@ -41,10 +46,12 @@ public void saveAuthorizationRequest(OAuth2AuthorizationRequest authorizationReq
                                          HttpServletResponse response) {
         if (authorizationRequest == null) {
             removeAuthorizationRequest(request, response);
+            log.debug("saveAuthorizationRequest() - 파라미터로 전달된 authorizationRequest가 null");
             return;
         }
 
         if (authorizationRequest.getState() == null) {
+            log.debug("saveAuthorizationRequest() - authorization.getState() 값 null");
             throw new IllegalArgumentException("authorizationRequest.state cannot be empty");
         }
         CookieUtils.addCookie(response, OAUTH2_AUTHORIZATION_REQUEST_COOKIE_NAME,
@@ -57,6 +64,8 @@ public OAuth2AuthorizationRequest removeAuthorizationRequest(HttpServletRequest
         OAuth2AuthorizationRequest authorizationRequest = loadAuthorizationRequest(request);
         if (authorizationRequest != null) {
             CookieUtils.deleteCookie(request, response, OAUTH2_AUTHORIZATION_REQUEST_COOKIE_NAME);
+        } else {
+            log.debug("removeAuthorizationRequest() - loadAuthorizationREquest() 리턴값 null");
         }
         return authorizationRequest;
     }