diff --git a/src/main/java/com/example/gp_backend_data/card/controller/StatsController.java b/src/main/java/com/example/gp_backend_data/card/controller/StatsController.java
index 638adbd..eeca785 100644
--- a/src/main/java/com/example/gp_backend_data/card/controller/StatsController.java
+++ b/src/main/java/com/example/gp_backend_data/card/controller/StatsController.java
@@ -5,14 +5,12 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
-import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.*;
 import org.springframework.web.server.ResponseStatusException;
 
 import java.time.LocalDate;
 import java.util.List;
+import java.util.UUID;
 
 @RestController
 @RequiredArgsConstructor
@@ -39,14 +37,15 @@ public ResponseEntity<List<LatestActivityResponse>> getActivities(
             @RequestParam String filterByDate,
             @RequestParam String groupBy,
             @RequestParam(required = false) String from,
-            @RequestParam(required = false) String to
+            @RequestParam(required = false) String to,
+            @RequestHeader("x-auth-sub") UUID userId
     ) {
         if (!"spaceId".equals(groupBy)) {
             throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Invalid groupBy parameter");
         }
 
         if ("today".equals(filterByDate)) {
-            return ResponseEntity.ok(statsService.getTodayActivitiesGroupedBySpace());
+            return ResponseEntity.ok(statsService.getTodayActivitiesGroupedBySpace(userId));
         } else if ("range".equals(filterByDate)) {
             if (from == null || to == null) {
                 throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Missing 'from' or 'to' parameter for date range");
@@ -54,7 +53,7 @@ public ResponseEntity<List<LatestActivityResponse>> getActivities(
 
             LocalDate fromDate = LocalDate.parse(from);
             LocalDate toDate = LocalDate.parse(to);
-            return ResponseEntity.ok(statsService.getActivitiesByDateRangeGroupedBySpace(fromDate, toDate));
+            return ResponseEntity.ok(statsService.getActivitiesByDateRangeGroupedBySpace(fromDate, toDate, userId));
         }
 
         throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Invalid filterByDate parameter");
diff --git a/src/main/java/com/example/gp_backend_data/card/domain/entity/Card.java b/src/main/java/com/example/gp_backend_data/card/domain/entity/Card.java
index f60ccaf..776f2b8 100644
--- a/src/main/java/com/example/gp_backend_data/card/domain/entity/Card.java
+++ b/src/main/java/com/example/gp_backend_data/card/domain/entity/Card.java
@@ -50,5 +50,7 @@ public class Card {
     @OneToMany(mappedBy = "card", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
     private List<Cardlink> cardlinks;
 
+    private byte[] createdBy; // 사용자 ID 저장 필드 (x-auth-sub와 매칭됨)
+
 }
 
diff --git a/src/main/java/com/example/gp_backend_data/card/service/CardService.java b/src/main/java/com/example/gp_backend_data/card/service/CardService.java
index f578ad1..1e12117 100644
--- a/src/main/java/com/example/gp_backend_data/card/service/CardService.java
+++ b/src/main/java/com/example/gp_backend_data/card/service/CardService.java
@@ -21,9 +21,7 @@
 import org.springframework.web.server.ResponseStatusException;
 import org.springframework.http.HttpStatus;
 
-import java.time.LocalDate;
-import java.time.LocalDateTime;
-import java.time.LocalTime;
+import java.time.*;
 import java.util.List;
 import java.util.UUID;
 import java.util.stream.Collectors;
@@ -42,6 +40,9 @@ public class CardService {
     //지식카드 생성
     public CardCreateResponse createCard(CardCreateRequest request) {
 
+        // 한국 시간으로 LocalDateTime 생성
+        LocalDateTime nowInKorea = ZonedDateTime.now(ZoneId.of("Asia/Seoul")).toLocalDateTime();
+
         Card card = Card.builder()
                 .cardId(uuidHelper.convertUUIDToByteArray(UUID.randomUUID()))
                 .spaceId(uuidHelper.convertUUIDToByteArray(request.getSpaceId()))
@@ -49,7 +50,7 @@ public CardCreateResponse createCard(CardCreateRequest request) {
                 //.color(uuidHelper.convertHexToBytes(request.getColor()))
                 .aiSummary("")
                 //.userSummary("")
-                .createdAt(LocalDateTime.now())
+                .createdAt(nowInKorea)
                 .build();
 
         Card savedCard = cardRepository.save(card);
diff --git a/src/main/java/com/example/gp_backend_data/card/service/StatsService.java b/src/main/java/com/example/gp_backend_data/card/service/StatsService.java
index 081955d..2abb589 100644
--- a/src/main/java/com/example/gp_backend_data/card/service/StatsService.java
+++ b/src/main/java/com/example/gp_backend_data/card/service/StatsService.java
@@ -18,10 +18,7 @@
 
 import java.time.LocalDate;
 import java.time.LocalDateTime;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Map;
-import java.util.UUID;
+import java.util.*;
 import java.util.stream.Collectors;
 
 @Service
@@ -80,22 +77,27 @@ public class StatsService {
 //        return results;
 //    }
 
-    public List<LatestActivityResponse> getTodayActivitiesGroupedBySpace() {
+    public List<LatestActivityResponse> getTodayActivitiesGroupedBySpace(UUID userId) {
         LocalDate today = LocalDate.now();
-        return getActivitiesByDateRangeGroupedBySpace(today, today);
+        return getActivitiesByDateRangeGroupedBySpace(today, today, userId);
     }
 
-    public List<LatestActivityResponse> getActivitiesByDateRangeGroupedBySpace(LocalDate from, LocalDate to) {
+    public List<LatestActivityResponse> getActivitiesByDateRangeGroupedBySpace(LocalDate from, LocalDate to, UUID userId) {
         LocalDateTime start = from.atStartOfDay();
         LocalDateTime end = to.plusDays(1).atStartOfDay(); // exclusive upper bound
 
         List<Card> cards = cardRepository.findCardsCreatedBetween(start, end);
 
+        //사용자가 생성한 카드만 필터링
+        List<Card> userCards = cards.stream()
+                .filter(card -> Arrays.equals(uuidHelper.convertUUIDToByteArray(userId), card.getCreatedBy())) // `createdBy`는 Card 엔티티에 있어야 합니다.
+                .toList();
+
         if (cards.isEmpty()) {
             throw new ResponseStatusException(HttpStatus.NOT_FOUND, "No activity found for selected date range.");
         }
 
-        Map<String, List<Card>> groupedBySpace = cards.stream()
+        Map<String, List<Card>> groupedBySpace = userCards.stream()
                 .collect(Collectors.groupingBy(card -> uuidHelper.convertByteArrayToUUID(card.getSpaceId()).toString()));
 
         List<LatestActivityResponse> results = new ArrayList<>();