diff --git a/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java b/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java
index 4578d7a..6e5a057 100644
--- a/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java
+++ b/src/main/java/DiffLens/back_end/global/aop/ApiRequestLogAspect.java
@@ -1,5 +1,6 @@
 package DiffLens.back_end.global.aop;
 
+import DiffLens.back_end.domain.members.entity.Member;
 import DiffLens.back_end.domain.members.service.auth.CurrentUserService;
 import jakarta.servlet.http.HttpServletRequest;
 import lombok.RequiredArgsConstructor;
@@ -33,14 +34,14 @@ public Object logApiRequest(ProceedingJoinPoint jp) throws Throwable {
         String uri = request.getRequestURI();
         String httpMethod = request.getMethod();
 
-        Object currentUser = null;
+        Member currentUser = null;
         try { currentUser = authService.getCurrentUser(); } catch (Exception ignored) {}
 
         String methodName = jp.getSignature().getName();
         String args = jp.getArgs() != null ? String.join(", ", java.util.Arrays.stream(jp.getArgs())
                 .map(String::valueOf).toArray(String[]::new)) : "";
 
-        String userInfo = currentUser != null ? "[User: " + currentUser + "]" : "[User: Anonymous]";
+        String userInfo = currentUser != null ? "[User: " + currentUser.getId() + "]" : "[User: Anonymous]";
         String requestInfo = "[" + httpMethod + ": " + uri + " - " + methodName + "(" + args + ")]";
 
         log.info("⏳ [API 호출 시작] {} {}", userInfo, requestInfo);
diff --git a/src/main/java/DiffLens/back_end/global/security/JwtAuthenticationFilter.java b/src/main/java/DiffLens/back_end/global/security/JwtAuthenticationFilter.java
index b8c5faf..7676589 100644
--- a/src/main/java/DiffLens/back_end/global/security/JwtAuthenticationFilter.java
+++ b/src/main/java/DiffLens/back_end/global/security/JwtAuthenticationFilter.java
@@ -8,6 +8,7 @@
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.security.authentication.AnonymousAuthenticationToken;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.Authentication;
@@ -19,6 +20,7 @@
 import java.io.IOException;
 import java.util.Collections;
 
+@Slf4j
 @Component
 @RequiredArgsConstructor
 public class JwtAuthenticationFilter extends OncePerRequestFilter {
@@ -61,7 +63,7 @@ protected void doFilterInternal(
             }
         } catch (Exception ex) {
             response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
-            response.getWriter().write("Internal server error occurred.");
+            log.error("\uD83D\uDEA8 {}", ex.getMessage());
         }
 
         filterChain.doFilter(request, response);