diff --git a/src/app/(modules)/ticket/hooks/useTicketDetailEvents.ts b/src/app/(modules)/ticket/hooks/useTicketDetailEvents.ts
index 94bd090..c1f6dce 100644
--- a/src/app/(modules)/ticket/hooks/useTicketDetailEvents.ts
+++ b/src/app/(modules)/ticket/hooks/useTicketDetailEvents.ts
@@ -32,9 +32,6 @@ export function useTicketDetailEvents(
     queryClient.refetchQueries({
       queryKey: ticketKeys.timeline(ticketId),
     });
-    queryClient.invalidateQueries({
-      queryKey: ticketKeys.defectClasses(ticketId),
-    });
     queryClient.invalidateQueries({ queryKey: ticketKeys.lists() });
   }, [queryClient, ticketId]);
 
diff --git a/src/app/(modules)/ticket/hooks/useTicketQueries.ts b/src/app/(modules)/ticket/hooks/useTicketQueries.ts
index 77e1410..5aed3da 100644
--- a/src/app/(modules)/ticket/hooks/useTicketQueries.ts
+++ b/src/app/(modules)/ticket/hooks/useTicketQueries.ts
@@ -77,14 +77,6 @@ export function useTicketTimelineQuery(ticketId: string | undefined) {
   });
 }
 
-export function useTicketDefectClassesQuery(ticketId: string | undefined) {
-  return useQuery({
-    queryKey: ticketKeys.defectClasses(ticketId ?? ''),
-    queryFn: () => ticketService.getTicketDefectClasses(ticketId as string),
-    enabled: Boolean(ticketId),
-  });
-}
-
 export function useTicketAssignmentsQuery(
   ticketId: string | undefined,
   initialAssignments?: TicketAssignmentSummary[],
@@ -231,9 +223,6 @@ export function useDiscardDetectionMutation(
         queryClient.invalidateQueries({
           queryKey: ticketKeys.overview(ticketId),
         }),
-        queryClient.invalidateQueries({
-          queryKey: ticketKeys.defectClasses(ticketId),
-        }),
         queryClient.invalidateQueries({ queryKey: ticketKeys.lists() }),
         queryClient.invalidateQueries({
           queryKey: ticketKeys.assignments(ticketId),
@@ -274,9 +263,6 @@ export function useReviewDetectionRepairProofMutation({
               queryKey: ticketKeys.classDetectionLists(videoId),
             })
           : Promise.resolve(),
-        queryClient.invalidateQueries({
-          queryKey: ticketKeys.defectClasses(ticketId),
-        }),
         queryClient.invalidateQueries({
           queryKey: ticketKeys.overview(ticketId),
         }),
diff --git a/src/app/(modules)/ticket/queries/ticketKeys.ts b/src/app/(modules)/ticket/queries/ticketKeys.ts
index 3bb1de7..b288657 100644
--- a/src/app/(modules)/ticket/queries/ticketKeys.ts
+++ b/src/app/(modules)/ticket/queries/ticketKeys.ts
@@ -32,8 +32,6 @@ export const ticketKeys = {
       'review',
       proofStatus ?? 'all',
     ] as const,
-  defectClasses: (ticketId: string) =>
-    [...ticketKeys.details(), ticketId, 'defect-classes'] as const,
   assignments: (ticketId: string) =>
     [...ticketKeys.details(), ticketId, 'assignments'] as const,
   extensionRequest: (ticketId: string, assignmentId: number | undefined) =>
diff --git a/src/constants/apiRoutes.ts b/src/constants/apiRoutes.ts
index 3458f44..639a5fe 100644
--- a/src/constants/apiRoutes.ts
+++ b/src/constants/apiRoutes.ts
@@ -66,7 +66,6 @@ export const API_ROUTES = {
     BASE: '/biz/api/v1/tickets',
     DETAIL: (id: string) => `/biz/api/v1/tickets/${id}`,
     TIMELINE: (id: string) => `/biz/api/v1/tickets/${id}/timeline`,
-    DEFECT_CLASSES: (id: string) => `/biz/api/v1/tickets/${id}/defect-classes`,
     ASSIGNMENTS: (id: string) => `/biz/api/v1/tickets/${id}/assignments`,
     REQUEST_EXTENSION: (ticketId: string, assignmentId: number) =>
       `/biz/api/v1/tickets/${ticketId}/assignments/${assignmentId}/extension-requests`,
diff --git a/src/constants/defectClassStatus.ts b/src/constants/defectClassStatus.ts
deleted file mode 100644
index 50d00a4..0000000
--- a/src/constants/defectClassStatus.ts
+++ /dev/null
@@ -1,35 +0,0 @@
-import type { TicketDefectClassTicketStatus } from '@/types';
-
-export const DEFECT_CLASS_STATUS_CONFIG: Record<
-  TicketDefectClassTicketStatus,
-  {
-    label: string;
-    badgeClassName: string;
-  }
-> = {
-  unassigned: {
-    label: 'Unassigned',
-    badgeClassName:
-      'bg-zinc-500/15 text-zinc-600 dark:bg-zinc-500/20 dark:text-zinc-300',
-  },
-  assigned: {
-    label: 'Assigned',
-    badgeClassName:
-      'bg-red-500/15 text-red-600 dark:bg-red-500/20 dark:text-red-400',
-  },
-  under_review: {
-    label: 'Under Review',
-    badgeClassName:
-      'bg-violet-500/15 text-violet-600 dark:bg-violet-500/20 dark:text-violet-400',
-  },
-  approved: {
-    label: 'Approved',
-    badgeClassName:
-      'bg-emerald-500/15 text-emerald-600 dark:bg-emerald-500/20 dark:text-emerald-400',
-  },
-  rejected: {
-    label: 'Rejected',
-    badgeClassName:
-      'bg-orange-500/15 text-orange-600 dark:bg-orange-500/20 dark:text-orange-400',
-  },
-};
diff --git a/src/services/api/ticket.service.ts b/src/services/api/ticket.service.ts
index 4cc879e..c17acec 100644
--- a/src/services/api/ticket.service.ts
+++ b/src/services/api/ticket.service.ts
@@ -13,7 +13,6 @@ import type {
   TicketExtensionRequestsResponse,
   TicketExtensionRequestsParams,
   TicketOverviewDetail,
-  TicketDefectClassesResponse,
   TicketListParams,
   TicketListResponse,
   TicketTimelineResponse,
@@ -62,15 +61,6 @@ export const ticketService = {
     return response.data;
   },
 
-  getTicketDefectClasses: async (
-    ticketId: string,
-  ): Promise<TicketDefectClassesResponse> => {
-    const response = await axiosClient.get<TicketDefectClassesResponse>(
-      API_ROUTES.TICKETS.DEFECT_CLASSES(ticketId),
-    );
-    return response.data;
-  },
-
   getAssignableUsers: async (
     params?: AssignableTicketUsersParams,
   ): Promise<AssignableTicketUsersResponse> => {
diff --git a/src/types/ticket/defect-class.ts b/src/types/ticket/defect-class.ts
deleted file mode 100644
index af058ef..0000000
--- a/src/types/ticket/defect-class.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-export type TicketDefectClassTicketStatus =
-  | 'unassigned'
-  | 'assigned'
-  | 'under_review'
-  | 'approved'
-  | 'rejected';
-
-export interface TicketDefectClassItem {
-  class_name: string;
-  display_name: string;
-  assignment_status: TicketDefectClassTicketStatus;
-}
-
-export interface TicketDefectClassesResponse {
-  ticket_id: string;
-  video_id: string;
-  ticket_status: TicketDefectClassTicketStatus;
-  defect_classes: TicketDefectClassItem[];
-}
diff --git a/src/types/ticket/index.ts b/src/types/ticket/index.ts
index ebbaa7c..a881f6e 100644
--- a/src/types/ticket/index.ts
+++ b/src/types/ticket/index.ts
@@ -2,6 +2,5 @@ export * from './status';
 export * from './list';
 export * from './detail';
 export * from './actions';
-export * from './defect-class';
 export * from './events';
 export * from './timeline';