diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundRequest.java b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundRequest.java
index 2d77c9b5..8ea59e6f 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundRequest.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundRequest.java
@@ -11,6 +11,7 @@
 
 import java.time.LocalDate;
 import java.time.LocalTime;
+import java.util.UUID;
 
 @Getter
 @Builder
@@ -23,6 +24,15 @@
 )
 public class AttendanceRoundRequest {
 
+    @NotNull(message = "세션 ID는 필수입니다")
+    @Schema(
+            description = "회차가 속할 세션의 ID",
+            example = "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+            type = "string",
+            format = "uuid"
+    )
+    private UUID sessionId;
+
     @Schema(
             description = "라운드 진행 날짜 (YYYY-MM-DD 형식)",
             example = "2025-11-06",
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundResponse.java b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundResponse.java
index e600bd5b..3ba856f4 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundResponse.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceRoundResponse.java
@@ -7,12 +7,9 @@
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import org.sejongisc.backend.attendance.entity.AttendanceRound;
-import org.sejongisc.backend.attendance.entity.RoundStatus;
-import org.sejongisc.backend.attendance.entity.AttendanceStatus;
 
 import java.time.LocalDate;
 import java.time.LocalTime;
-import java.util.List;
 import java.util.UUID;
 
 @Getter
@@ -21,7 +18,7 @@
 @AllArgsConstructor
 @Schema(
         title = "출석 라운드 응답",
-        description = "출석 라운드의 상세 정보. 라운드 상태, 시간, 출석 현황 통계를 포함합니다."
+        description = "출석 라운드의 상세 정보. 라운드 날짜, 시간, 상태를 포함합니다."
 )
 public class AttendanceRoundResponse {
 
@@ -42,107 +39,40 @@ public class AttendanceRoundResponse {
 
     @Schema(
             description = "라운드 출석 시작 시간",
-            example = "10:00",
+            example = "10:00:00",
             type = "string",
             format = "time"
     )
-    @JsonFormat(pattern = "HH:mm")
+    @JsonFormat(pattern = "HH:mm:ss")
     private LocalTime startTime;
 
-    @Schema(
-            description = "라운드 출석 종료 시간 (startTime + allowedMinutes)",
-            example = "10:30",
-            type = "string",
-            format = "time"
-    )
-    @JsonFormat(pattern = "HH:mm")
-    private LocalTime endTime;
-
     @Schema(
             description = "출석 가능한 시간 (분단위)",
-            example = "30"
-    )
-    private Integer allowedMinutes;
-
-    @Schema(
-            description = "라운드의 현재 상태. UPCOMING(시작 전), ACTIVE(진행 중), CLOSED(종료됨)",
-            example = "ACTIVE",
-            implementation = RoundStatus.class
-    )
-    private RoundStatus roundStatus;
-
-    @Schema(
-            description = "라운드의 이름/제목. 예: 1주차, 2주차 등",
-            example = "1주차"
-    )
-    private String roundName;
-
-    @Schema(
-            description = "정시 출석자 수",
             example = "20"
     )
-    private Long presentCount;
-
-    @Schema(
-            description = "지각 출석자 수",
-            example = "5"
-    )
-    private Long lateCount;
+    private Integer availableMinutes;
 
     @Schema(
-            description = "결석자 수",
-            example = "3"
+            description = "라운드의 현재 상태. (upcoming, active, closed 등)",
+            example = "active"
     )
-    private Long absentCount;
-
-    @Schema(
-            description = "총 출석자 수",
-            example = "28"
-    )
-    private Long totalAttendees;
+    private String status;
 
     /**
      * 엔티티를 DTO로 변환
-     * roundStatus는 실시간으로 계산되어 반환됨
-     * 출석 통계는 단일 루프로 효율적으로 계산됨
+     * status는 실시간으로 계산되어 반환됨
      */
     public static AttendanceRoundResponse fromEntity(AttendanceRound round) {
-        // attendances 리스트가 null일 수 있으므로 방어
-        var attendances = round.getAttendances();
-        if (attendances == null) {
-            attendances = List.of();
-        }
-
-        // 단일 루프로 모든 통계를 효율적으로 계산
-        long presentCount = 0;
-        long lateCount = 0;
-        long absentCount = 0;
-
-        for (var attendance : attendances) {
-            if (attendance.getAttendanceStatus() == AttendanceStatus.PRESENT) {
-                presentCount++;
-            } else if (attendance.getAttendanceStatus() == AttendanceStatus.LATE) {
-                lateCount++;
-            } else if (attendance.getAttendanceStatus() == AttendanceStatus.ABSENT) {
-                absentCount++;
-            }
-        }
-
         // 현재 시간 기준으로 라운드 상태를 실시간 계산
-        RoundStatus currentStatus = round.calculateCurrentStatus();
+        // RoundStatus.getValue()를 사용하여 명시적이고 안전한 변환
+        String statusString = round.calculateCurrentStatus().getValue();
 
         return AttendanceRoundResponse.builder()
                 .roundId(round.getRoundId())
                 .roundDate(round.getRoundDate())
                 .startTime(round.getStartTime())
-                .endTime(round.getEndTime())
-                .allowedMinutes(round.getAllowedMinutes())
-                .roundStatus(currentStatus)
-                .roundName(round.getRoundName())
-                .presentCount(presentCount)
-                .lateCount(lateCount)
-                .absentCount(absentCount)
-                .totalAttendees((long) attendances.size())
+                .availableMinutes(round.getAllowedMinutes())
+                .status(statusString)
                 .build();
     }
 }
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceSessionResponse.java b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceSessionResponse.java
index afbb7250..e82e813e 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceSessionResponse.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/dto/AttendanceSessionResponse.java
@@ -3,10 +3,8 @@
 import com.fasterxml.jackson.annotation.JsonFormat;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.*;
-import org.sejongisc.backend.attendance.entity.SessionStatus;
-import org.sejongisc.backend.attendance.entity.SessionVisibility;
 
-import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.util.UUID;
 
 @Getter
@@ -15,7 +13,7 @@
 @AllArgsConstructor
 @Schema(
         title = "출석 세션 응답",
-        description = "출석 세션의 상세 정보. 세션 설정, 상태, 남은 시간, 참여자 수 등을 포함합니다."
+        description = "출석 세션의 상세 정보. 세션 설정, 기본 시간, 위치 등을 포함합니다."
 )
 public class AttendanceSessionResponse {
 
@@ -27,84 +25,50 @@ public class AttendanceSessionResponse {
 
     @Schema(
             description = "세션의 제목/이름",
-            example = "2024년 10월 동아리 정기 모임"
+            example = "금융 IT팀 세션"
     )
     private String title;
 
     @Schema(
-            description = "출석 체크인이 가능한 시간 윈도우 (초 단위)",
-            example = "1800"
+            description = "세션 개최 위치 정보",
+            example = "{\"lat\": 37.5499, \"lng\": 127.0751}"
     )
-    private Integer windowSeconds;
+    private LocationInfo location;
 
     @Schema(
-            description = "출석 완료 시 지급할 포인트",
-            example = "10"
+            description = "세션의 기본 시작 시간",
+            example = "18:30:00"
     )
-    private Integer rewardPoints;
+    @JsonFormat(pattern = "HH:mm:ss")
+    private LocalTime defaultStartTime;
 
     @Schema(
-            description = "세션 개최 위치의 위도",
-            example = "37.4979"
+            description = "출석 인정 시간 (분 단위)",
+            example = "30"
     )
-    private Double latitude;
+    private Integer defaultAvailableMinutes;
 
     @Schema(
-            description = "세션 개최 위치의 경도",
-            example = "127.0276"
-    )
-    private Double longitude;
-
-    @Schema(
-            description = "GPS 기반 위치 검증 반경 (미터 단위)",
+            description = "출석 완료 시 지급할 포인트",
             example = "100"
     )
-    private Integer radiusMeters;
-
-    @Schema(
-            description = "세션의 공개 범위. PUBLIC(공개) 또는 PRIVATE(비공개)",
-            example = "PUBLIC",
-            implementation = SessionVisibility.class
-    )
-    private SessionVisibility visibility;
-
-    @Schema(
-            description = "세션의 현재 상태. UPCOMING(예정), OPEN(진행중), CLOSED(종료)",
-            example = "OPEN",
-            implementation = SessionStatus.class
-    )
-    private SessionStatus status;
-
-    @Schema(
-            description = "세션 레코드 생성 시간",
-            example = "2024-10-31 10:00:00"
-    )
-    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
-    private LocalDateTime createdAt;
-
-    @Schema(
-            description = "세션 레코드 최종 수정 시간",
-            example = "2024-10-31 11:30:00"
-    )
-    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
-    private LocalDateTime updatedAt;
-
-    @Schema(
-            description = "현재부터 체크인 마감까지 남은 시간 (초 단위). 음수이면 마감됨",
-            example = "1234"
-    )
-    private Long remainingSeconds;
+    private Integer rewardPoints;
 
     @Schema(
-            description = "현재 체크인이 가능한 상태인지 여부. " +
-                    "true면 지금 체크인 가능, false면 불가능",
+            description = "세션의 공개 여부. true(공개) 또는 false(비공개)",
             example = "true"
     )
-    private boolean checkInAvailable;
-
-    @Schema(
-            description = "현재 세션에 참여한 학생 수",
-            example = "25"
-    )
-    private Integer participantCount;
+    private Boolean isVisible;
+
+    @Getter
+    @Builder
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class LocationInfo {
+        @Schema(description = "위도", example = "37.5499")
+        private Double lat;
+
+        @Schema(description = "경도", example = "127.0751")
+        private Double lng;
+    }
 }
\ No newline at end of file
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/entity/RoundStatus.java b/backend/src/main/java/org/sejongisc/backend/attendance/entity/RoundStatus.java
index 2e1be229..cfc25142 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/entity/RoundStatus.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/entity/RoundStatus.java
@@ -4,17 +4,29 @@
  * 라운드(주차) 상태
  */
 public enum RoundStatus {
-    UPCOMING("진행 예정"),
-    ACTIVE("진행 중"),
-    CLOSED("마감됨");
+    UPCOMING("진행 예정", "upcoming"),
+    ACTIVE("진행 중", "active"),
+    CLOSED("마감됨", "closed");
 
     private final String description;
+    private final String value;
 
-    RoundStatus(String description) {
+    RoundStatus(String description, String value) {
         this.description = description;
+        this.value = value;
     }
 
     public String getDescription() {
         return description;
     }
+
+    /**
+     * API 응답에 사용할 문자열 값 반환
+     * toString().toLowerCase()와 달리 명시적이고 안전함
+     *
+     * @return API 응답용 상태값 (lowercase)
+     */
+    public String getValue() {
+        return value;
+    }
 }
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
index 3184006e..64c6fb9e 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceRoundService.java
@@ -71,6 +71,8 @@ public AttendanceRoundResponse createRound(UUID sessionId, AttendanceRoundReques
 
             AttendanceRound saved = attendanceRoundRepository.save(round);
             session.getRounds().add(saved);
+            // 양방향 관계를 DB에 반영하기 위해 세션도 저장
+            attendanceSessionRepository.save(session);
 
             log.info("✅ 라운드 생성 완료 - sessionId: {}, roundId: {}, roundDate: {}, roundStatus: {}",
                     sessionId, saved.getRoundId(), saved.getRoundDate(), saved.getRoundStatus());
diff --git a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceSessionService.java b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceSessionService.java
index 95053976..46df8939 100644
--- a/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceSessionService.java
+++ b/backend/src/main/java/org/sejongisc/backend/attendance/service/AttendanceSessionService.java
@@ -15,8 +15,8 @@
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.util.List;
-import java.util.Random;
 import java.util.UUID;
 import java.util.stream.Collectors;
 
@@ -323,40 +323,37 @@ private String generateRandomCode() {
 
     /**
      * AttendanceSession 엔티티를 Response DTO로 변환
-     * - 남은 시간, 체크인 가능 여부, 참여자 수 계산
-     * - 현재 시간 기준으로 동적 정보 생성
+     * - 기본 세션 정보: 제목, 시작 시간, 출석 인정 시간, 보상 포인트
+     * - 위치 정보: location 객체 (lat, lng)
+     * - 공개 여부: isVisible boolean
      */
     private AttendanceSessionResponse convertToResponse(AttendanceSession session) {
-        LocalDateTime now = LocalDateTime.now();
-        LocalDateTime endTime = session.getStartsAt().plusSeconds(session.getWindowSeconds());
+        // 위치 정보 변환 (location이 존재하면 LocationInfo 객체 생성, 없으면 null)
+        AttendanceSessionResponse.LocationInfo location = null;
+        if (session.getLocation() != null) {
+            location = AttendanceSessionResponse.LocationInfo.builder()
+                    .lat(session.getLocation().getLat())
+                    .lng(session.getLocation().getLng())
+                    .build();
+        }
 
-        Long remainingSeconds = null;
-        boolean checkInAvailable = false;
+        // defaultAvailableMinutes: windowSeconds를 분 단위로 변환
+        Integer defaultAvailableMinutes = (int) (session.getWindowSeconds() / 60);
 
-        if (now.isBefore(session.getStartsAt())) {
-            remainingSeconds = java.time.Duration.between(now, session.getStartsAt()).getSeconds();
-        } else if (now.isBefore(endTime)) {
-            remainingSeconds = java.time.Duration.between(now, endTime).getSeconds();
-            checkInAvailable = session.getStatus() == SessionStatus.OPEN;
-        }
+        // defaultStartTime: startsAt에서 시간 부분만 추출
+        LocalTime defaultStartTime = session.getStartsAt().toLocalTime();
 
-        Long participantCount = attendanceRepository.countByAttendanceSession(session);
+        // isVisible: 공개 세션이면 true, 비공개면 false
+        Boolean isVisible = session.getVisibility() == SessionVisibility.PUBLIC;
 
         return AttendanceSessionResponse.builder()
                 .attendanceSessionId(session.getAttendanceSessionId())
                 .title(session.getTitle())
-                .windowSeconds(session.getWindowSeconds())
+                .location(location)
+                .defaultStartTime(defaultStartTime)
+                .defaultAvailableMinutes(defaultAvailableMinutes)
                 .rewardPoints(session.getRewardPoints())
-                .latitude(session.getLocation() != null ? session.getLocation().getLat() : null)
-                .longitude(session.getLocation() != null ? session.getLocation().getLng() : null)
-                .radiusMeters(session.getLocation() != null ? session.getLocation().getRadiusMeters() : null)
-                .visibility(session.getVisibility())
-                .status(session.getStatus())
-                .createdAt(session.getCreatedDate())
-                .updatedAt(session.getUpdatedDate())
-                .remainingSeconds(remainingSeconds)
-                .checkInAvailable(checkInAvailable)
-                .participantCount(participantCount.intValue())
+                .isVisible(isVisible)
                 .build();
 
     }
diff --git a/backend/src/test/java/org/sejongisc/backend/attendance/controller/AttendanceSessionControllerTest.java b/backend/src/test/java/org/sejongisc/backend/attendance/controller/AttendanceSessionControllerTest.java
index d6a9d89c..e0f997ef 100644
--- a/backend/src/test/java/org/sejongisc/backend/attendance/controller/AttendanceSessionControllerTest.java
+++ b/backend/src/test/java/org/sejongisc/backend/attendance/controller/AttendanceSessionControllerTest.java
@@ -5,7 +5,6 @@
 import org.junit.jupiter.api.Test;
 import org.sejongisc.backend.attendance.dto.AttendanceSessionRequest;
 import org.sejongisc.backend.attendance.dto.AttendanceSessionResponse;
-import org.sejongisc.backend.attendance.entity.SessionStatus;
 import org.sejongisc.backend.attendance.entity.SessionVisibility;
 import org.sejongisc.backend.attendance.service.AttendanceSessionService;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -18,6 +17,7 @@
 import org.springframework.test.web.servlet.MockMvc;
 
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.util.Arrays;
 import java.util.List;
 import java.util.UUID;
@@ -62,17 +62,14 @@ void createSession_success() throws Exception {
         AttendanceSessionResponse response = AttendanceSessionResponse.builder()
                 .attendanceSessionId(UUID.randomUUID())
                 .title("세투연 정규 세션")
-                .tag("금융IT")
-                .startsAt(request.getStartsAt())
-                .windowSeconds(1800)
-                .code("123456")
+                .defaultStartTime(LocalDateTime.now().plusHours(1).toLocalTime())
+                .defaultAvailableMinutes(30)
                 .rewardPoints(10)
-                .latitude(37.5665)
-                .longitude(126.9780)
-                .radiusMeters(100)
-                .visibility(SessionVisibility.PUBLIC)
-                .status(SessionStatus.UPCOMING)
-                .participantCount(0)
+                .location(AttendanceSessionResponse.LocationInfo.builder()
+                        .lat(37.5665)
+                        .lng(126.9780)
+                        .build())
+                .isVisible(true)
                 .build();
 
         when(attendanceSessionService.createSession(any(AttendanceSessionRequest.class))).thenReturn(response);
@@ -83,15 +80,11 @@ void createSession_success() throws Exception {
                         .content(objectMapper.writeValueAsString(request)))
                 .andExpect(status().isCreated())
                 .andExpect(jsonPath("$.title").value("세투연 정규 세션"))
-                .andExpect(jsonPath("$.tag").value("금융IT"))
-                .andExpect(jsonPath("$.code").value("123456"))
                 .andExpect(jsonPath("$.rewardPoints").value(10))
-                .andExpect(jsonPath("$.latitude").value(37.5665))
-                .andExpect(jsonPath("$.longitude").value(126.9780))
-                .andExpect(jsonPath("$.radiusMeters").value(100))
-                .andExpect(jsonPath("$.visibility").value("PUBLIC"))
-                .andExpect(jsonPath("$.status").value("UPCOMING"))
-                .andExpect(jsonPath("$.participantCount").value(0));
+                .andExpect(jsonPath("$.location.lat").value(37.5665))
+                .andExpect(jsonPath("$.location.lng").value(126.9780))
+                .andExpect(jsonPath("$.isVisible").value(true))
+                .andExpect(jsonPath("$.defaultAvailableMinutes").value(30));
     }
 
     @Test
@@ -132,36 +125,6 @@ void createSession_fail_validation() throws Exception {
                 .andExpect(status().isInternalServerError());
     }
 
-    @Test
-    @DisplayName("출석 코드로 세션 조회 성공")
-    @WithMockUser
-    void getSessionByCode_success() throws Exception {
-        //given
-        String code = "123456";
-        AttendanceSessionResponse response = AttendanceSessionResponse.builder()
-                .attendanceSessionId(UUID.randomUUID())
-                .title("세투연 정규 세션")
-                .code(code)
-                .startsAt(LocalDateTime.now().plusMinutes(30))
-                .windowSeconds(1800)
-                .status(SessionStatus.UPCOMING)
-                .participantCount(5)
-                .remainingSeconds(1800L)
-                .checkInAvailable(false)
-                .build();
-
-        when(attendanceSessionService.getSessionByCode(code)).thenReturn(response);
-
-        //then
-        mockMvc.perform(get("/api/attendance/sessions/code/{code}", code))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.code").value(code))
-                .andExpect(jsonPath("$.title").value("세투연 정규 세션"))
-                .andExpect(jsonPath("$.participantCount").value(5))
-                .andExpect(jsonPath("$.remainingSeconds").value(1800))
-                .andExpect(jsonPath("$.checkInAvailable").value(false));
-    }
-
     @Test
     @DisplayName("세션 상세 조회 성공")
     @WithMockUser
@@ -171,11 +134,10 @@ void getSession_success() throws Exception {
         AttendanceSessionResponse response = AttendanceSessionResponse.builder()
                 .attendanceSessionId(sessionId)
                 .title("세투연 정규 세션")
-                .code("123456")
-                .startsAt(LocalDateTime.now().plusHours(1))
-                .windowSeconds(1800)
-                .status(SessionStatus.UPCOMING)
-                .participantCount(0)
+                .defaultStartTime(LocalTime.of(10, 0))
+                .defaultAvailableMinutes(30)
+                .rewardPoints(10)
+                .isVisible(true)
                 .build();
 
         when(attendanceSessionService.getSessionById(sessionId)).thenReturn(response);
@@ -184,8 +146,7 @@ void getSession_success() throws Exception {
         mockMvc.perform(get("/api/attendance/sessions/{sessionId}", sessionId))
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.attendanceSessionId").value(sessionId.toString()))
-                .andExpect(jsonPath("$.title").value("세투연 정규 세션"))
-                .andExpect(jsonPath("$.code").value("123456"));
+                .andExpect(jsonPath("$.title").value("세투연 정규 세션"));
     }
 
     @Test
@@ -197,18 +158,18 @@ void getPublicSessions_success() throws Exception {
                 AttendanceSessionResponse.builder()
                         .attendanceSessionId(UUID.randomUUID())
                         .title("정규 세션 1")
-                        .code("111111")
-                        .status(SessionStatus.UPCOMING)
-                        .visibility(SessionVisibility.PUBLIC)
-                        .participantCount(10)
+                        .defaultStartTime(LocalTime.of(10, 0))
+                        .defaultAvailableMinutes(30)
+                        .rewardPoints(10)
+                        .isVisible(true)
                         .build(),
                 AttendanceSessionResponse.builder()
                         .attendanceSessionId(UUID.randomUUID())
                         .title("정규 세션 2")
-                        .code("222222")
-                        .status(SessionStatus.OPEN)
-                        .visibility(SessionVisibility.PUBLIC)
-                        .participantCount(5)
+                        .defaultStartTime(LocalTime.of(14, 0))
+                        .defaultAvailableMinutes(30)
+                        .rewardPoints(15)
+                        .isVisible(true)
                         .build()
         );
 
@@ -219,9 +180,7 @@ void getPublicSessions_success() throws Exception {
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.length()").value(2))
                 .andExpect(jsonPath("$[0].title").value("정규 세션 1"))
-                .andExpect(jsonPath("$[0].participantCount").value(10))
-                .andExpect(jsonPath("$[1].title").value("정규 세션 2"))
-                .andExpect(jsonPath("$[1].participantCount").value(5));
+                .andExpect(jsonPath("$[1].title").value("정규 세션 2"));
     }
 
     @Test
@@ -233,11 +192,10 @@ void getActivateSessions_success() throws Exception {
                 AttendanceSessionResponse.builder()
                         .attendanceSessionId(UUID.randomUUID())
                         .title("활성 세션")
-                        .code("111111")
-                        .status(SessionStatus.OPEN)
-                        .checkInAvailable(true)
-                        .remainingSeconds(900L)
-                        .participantCount(8)
+                        .defaultStartTime(LocalTime.of(10, 0))
+                        .defaultAvailableMinutes(30)
+                        .rewardPoints(10)
+                        .isVisible(true)
                         .build()
         );
 
@@ -247,44 +205,7 @@ void getActivateSessions_success() throws Exception {
         mockMvc.perform(get("/api/attendance/sessions/active"))
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.length()").value(1))
-                .andExpect(jsonPath("$[0].title").value("활성 세션"))
-                .andExpect(jsonPath("$[0].status").value("OPEN"))
-                .andExpect(jsonPath("$[0].checkInAvailable").value(true))
-                .andExpect(jsonPath("$[0].remainingSeconds").value(900))
-                .andExpect(jsonPath("$[0].participantCount").value(8));
-    }
-
-    @Test
-    @DisplayName("태그별 세션 목록 조회 성공")
-    @WithMockUser
-    void getSessionByTag_success() throws Exception {
-        //given
-        String tag = "금융IT";
-        List<AttendanceSessionResponse> responses = Arrays.asList(
-                AttendanceSessionResponse.builder()
-                        .attendanceSessionId(UUID.randomUUID())
-                        .title("금융IT 정규 세션 1")
-                        .tag(tag)
-                        .code("111111")
-                        .participantCount(16)
-                        .build(),
-                AttendanceSessionResponse.builder()
-                        .attendanceSessionId(UUID.randomUUID())
-                        .title("금융IT 정규 세션 2")
-                        .tag(tag)
-                        .code("222222")
-                        .participantCount(14)
-                        .build()
-        );
-
-        when(attendanceSessionService.getSessionsByTag(tag)).thenReturn(responses);
-
-        //then
-        mockMvc.perform(get("/api/attendance/sessions/tag/{tag}", tag))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.length()").value(2))
-                .andExpect(jsonPath("$[0].tag").value(tag))
-                .andExpect(jsonPath("$[1].tag").value(tag));
+                .andExpect(jsonPath("$[0].title").value("활성 세션"));
     }
 
     @Test
@@ -305,14 +226,10 @@ void updateSession_success() throws Exception {
         AttendanceSessionResponse response = AttendanceSessionResponse.builder()
                 .attendanceSessionId(sessionId)
                 .title("수정된 제목")
-                .tag("수정된 태그")
-                .startsAt(request.getStartsAt())
-                .windowSeconds(3600)
-                .code("123456")
+                .defaultStartTime(LocalTime.of(10, 0))
+                .defaultAvailableMinutes(60)
                 .rewardPoints(10)
-                .visibility(SessionVisibility.PRIVATE)
-                .status(SessionStatus.UPCOMING)
-                .participantCount(0)
+                .isVisible(false)
                 .build();
 
         when(attendanceSessionService.updateSession(eq(sessionId), any(AttendanceSessionRequest.class))).thenReturn(response);
@@ -323,9 +240,8 @@ void updateSession_success() throws Exception {
                         .content(objectMapper.writeValueAsString(request)))
                 .andExpect(status().isOk())
                 .andExpect(jsonPath("$.title").value("수정된 제목"))
-                .andExpect(jsonPath("$.tag").value("수정된 태그"))
                 .andExpect(jsonPath("$.rewardPoints").value(10))
-                .andExpect(jsonPath("$.visibility").value("PRIVATE"));
+                .andExpect(jsonPath("$.isVisible").value(false));
     }
 
     @Test
@@ -367,37 +283,6 @@ void deleteSession_success() throws Exception {
                 .andExpect(status().isNoContent());
     }
 
-    @Test
-    @DisplayName("상태별 세션 목록 조회 성공 (관리자)")
-    @WithMockUser(roles = "PRESIDENT")
-    void getSessionByStatus_success() throws Exception {
-        //given
-        SessionStatus status = SessionStatus.OPEN;
-        List<AttendanceSessionResponse> responses = Arrays.asList(
-                AttendanceSessionResponse.builder()
-                        .attendanceSessionId(UUID.randomUUID())
-                        .title("진행중인 세션 1")
-                        .status(status)
-                        .participantCount(8)
-                        .build(),
-                AttendanceSessionResponse.builder()
-                        .attendanceSessionId(UUID.randomUUID())
-                        .title("진행중인 세션 2")
-                        .status(status)
-                        .participantCount(14)
-                        .build()
-        );
-
-        when(attendanceSessionService.getSessionsByStatus(status)).thenReturn(responses);
-
-        //then
-        mockMvc.perform(get("/api/attendance/sessions/status/{status}", status))
-                .andExpect(status().isOk())
-                .andExpect(jsonPath("$.length()").value(2))
-                .andExpect(jsonPath("$[0].status").value("OPEN"))
-                .andExpect(jsonPath("$[1].status").value("OPEN"));
-    }
-
     @Test
     @DisplayName("관리자 전용 기능 접근 실패: 권한 없음")
     @WithMockUser(roles = "TEAM_MEMBER")
@@ -421,9 +306,5 @@ void adminOnlyEndpoints_fail_noPermission() throws Exception {
         // 세션 삭제
         mockMvc.perform(delete("/api/attendance/sessions/{sessionId}", sessionId))
                 .andExpect(status().isForbidden());
-
-        // 상태별 조회
-        mockMvc.perform(get("/api/attendance/sessions/status/OPEN"))
-                .andExpect(status().isForbidden());
     }
 }