diff --git a/adapters/in-web/src/main/kotlin/com/pokit/category/CategoryShareController.kt b/adapters/in-web/src/main/kotlin/com/pokit/category/CategoryShareController.kt
index dc908d62..7d0446f8 100644
--- a/adapters/in-web/src/main/kotlin/com/pokit/category/CategoryShareController.kt
+++ b/adapters/in-web/src/main/kotlin/com/pokit/category/CategoryShareController.kt
@@ -6,6 +6,7 @@ import com.pokit.category.dto.request.DuplicateCategoryRequest
 import com.pokit.category.dto.response.SharedContentsResponse
 import com.pokit.category.port.`in`.CategoryUseCase
 import com.pokit.common.wrapper.ResponseWrapper.wrapOk
+import com.pokit.common.wrapper.ResponseWrapper.wrapUnit
 import com.pokit.content.port.`in`.ContentUseCase
 import io.swagger.v3.oas.annotations.Operation
 import org.springframework.data.domain.Pageable
@@ -64,4 +65,14 @@ class CategoryShareController(
         )
             .wrapOk()
 
+    @Operation(summary = "포킷 초대 수락 API")
+    @PostMapping("/accept/{categoryId}")
+    fun acceptCategory(
+        @AuthenticationPrincipal user: PrincipalUser,
+        @PathVariable categoryId: Long,
+    ): ResponseEntity<Unit> {
+        return categoryUseCase.acceptCategory(user.id, categoryId)
+            .wrapUnit()
+    }
+
 }
diff --git a/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/impl/SharedCategoryAdapter.kt b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/impl/SharedCategoryAdapter.kt
new file mode 100644
index 00000000..c67d0c11
--- /dev/null
+++ b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/impl/SharedCategoryAdapter.kt
@@ -0,0 +1,24 @@
+package com.pokit.out.persistence.category.impl
+
+import com.pokit.category.model.SharedCategory
+import com.pokit.category.port.out.SharedCategoryPort
+import com.pokit.out.persistence.category.persist.SharedCategoryEntity
+import com.pokit.out.persistence.category.persist.SharedCategoryRepository
+import com.pokit.out.persistence.category.persist.toDomain
+import org.springframework.stereotype.Repository
+
+@Repository
+class SharedCategoryAdapter(
+    private val sharedCategoryRepository: SharedCategoryRepository
+) : SharedCategoryPort {
+    override fun persist(sharedCategory: SharedCategory): SharedCategory {
+        return sharedCategoryRepository.save(SharedCategoryEntity.of(sharedCategory))
+            .toDomain()
+    }
+
+    override fun loadByUserIdAndCategoryId(userId: Long, categoryId: Long): SharedCategory? {
+        return sharedCategoryRepository.findByUserIdAndCategoryId(userId, categoryId)
+            ?.toDomain()
+    }
+
+}
diff --git a/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/CategoryEntity.kt b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/CategoryEntity.kt
index f9bd9342..84f33f7d 100644
--- a/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/CategoryEntity.kt
+++ b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/CategoryEntity.kt
@@ -27,6 +27,12 @@ class CategoryEntity(
     @Column(name = "open_type")
     @Enumerated(EnumType.STRING)
     var openType: OpenType = OpenType.PRIVATE,
+
+    @Column(name = "user_count")
+    var userCount: Int = 0,
+
+    @Column(name = "is_shared")
+    var isShared: Boolean = false
 ) : BaseEntity() {
 
     @Column(name = "is_deleted")
@@ -44,6 +50,8 @@ class CategoryEntity(
                 name = category.categoryName,
                 image = CategoryImageEntity.of(category.categoryImage),
                 openType = category.openType,
+                userCount = category.userCount,
+                isShared = category.isShared
             )
     }
 }
@@ -55,4 +63,6 @@ fun CategoryEntity.toDomain() = Category(
     userId = this.userId,
     createdAt = this.createdAt,
     openType = this.openType,
+    userCount = this.userCount,
+    isShared = this.isShared
 )
diff --git a/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryEntity.kt b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryEntity.kt
new file mode 100644
index 00000000..a9f984eb
--- /dev/null
+++ b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryEntity.kt
@@ -0,0 +1,31 @@
+package com.pokit.out.persistence.category.persist
+
+import com.pokit.category.model.SharedCategory
+import com.pokit.out.persistence.BaseEntity
+import jakarta.persistence.*
+
+@Table(name = "SHARED_CATEGORY")
+@Entity
+class SharedCategoryEntity(
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    val id: Long = 0L,
+
+    @Column(name = "user_id")
+    val userId: Long,
+
+    @Column(name = "category_id")
+    val categoryId: Long,
+) : BaseEntity() {
+    companion object {
+        fun of(sharedCategory: SharedCategory) = SharedCategoryEntity(
+            userId = sharedCategory.userId,
+            categoryId = sharedCategory.categoryId
+        )
+    }
+}
+
+internal fun SharedCategoryEntity.toDomain() = SharedCategory(
+    userId = this.userId,
+    categoryId = this.categoryId
+)
diff --git a/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryRepository.kt b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryRepository.kt
new file mode 100644
index 00000000..41d04d13
--- /dev/null
+++ b/adapters/out-persistence/src/main/kotlin/com/pokit/out/persistence/category/persist/SharedCategoryRepository.kt
@@ -0,0 +1,7 @@
+package com.pokit.out.persistence.category.persist
+
+import org.springframework.data.jpa.repository.JpaRepository
+
+interface SharedCategoryRepository : JpaRepository<SharedCategoryEntity, Long> {
+    fun findByUserIdAndCategoryId(userId: Long, categoryId: Long): SharedCategoryEntity?
+}
diff --git a/application/src/main/kotlin/com/pokit/category/port/in/CategoryUseCase.kt b/application/src/main/kotlin/com/pokit/category/port/in/CategoryUseCase.kt
index 28516d1c..ab9adc57 100644
--- a/application/src/main/kotlin/com/pokit/category/port/in/CategoryUseCase.kt
+++ b/application/src/main/kotlin/com/pokit/category/port/in/CategoryUseCase.kt
@@ -18,4 +18,5 @@ interface CategoryUseCase {
     fun getSharedCategory(categoryId: Long, userId: Long): Category
     fun completeShare(categoryId: Long)
     fun duplicateCategory(originCategoryId: Long, categoryName: String, userId: Long, categoryImageId: Int)
+    fun acceptCategory(userId: Long, categoryId: Long)
 }
diff --git a/application/src/main/kotlin/com/pokit/category/port/out/SharedCategoryPort.kt b/application/src/main/kotlin/com/pokit/category/port/out/SharedCategoryPort.kt
new file mode 100644
index 00000000..151e5042
--- /dev/null
+++ b/application/src/main/kotlin/com/pokit/category/port/out/SharedCategoryPort.kt
@@ -0,0 +1,9 @@
+package com.pokit.category.port.out
+
+import com.pokit.category.model.SharedCategory
+
+interface SharedCategoryPort {
+    fun persist(sharedCategory: SharedCategory): SharedCategory
+
+    fun loadByUserIdAndCategoryId(userId: Long, categoryId: Long): SharedCategory?
+}
diff --git a/application/src/main/kotlin/com/pokit/category/port/service/CategoryService.kt b/application/src/main/kotlin/com/pokit/category/port/service/CategoryService.kt
index bbfa7f88..f80bde59 100644
--- a/application/src/main/kotlin/com/pokit/category/port/service/CategoryService.kt
+++ b/application/src/main/kotlin/com/pokit/category/port/service/CategoryService.kt
@@ -4,15 +4,14 @@ import com.pokit.category.dto.CategoriesResponse
 import com.pokit.category.dto.CategoryCommand
 import com.pokit.category.dto.toCategoriesResponse
 import com.pokit.category.exception.CategoryErrorCode
-import com.pokit.category.model.Category
-import com.pokit.category.model.CategoryImage
+import com.pokit.category.model.*
 import com.pokit.category.model.CategoryStatus.UNCATEGORIZED
-import com.pokit.category.model.OpenType
-import com.pokit.category.model.duplicate
 import com.pokit.category.port.`in`.CategoryUseCase
 import com.pokit.category.port.out.CategoryImagePort
 import com.pokit.category.port.out.CategoryPort
+import com.pokit.category.port.out.SharedCategoryPort
 import com.pokit.common.exception.AlreadyExistsException
+import com.pokit.common.exception.ClientValidationException
 import com.pokit.common.exception.InvalidRequestException
 import com.pokit.common.exception.NotFoundCustomException
 import com.pokit.content.port.out.ContentPort
@@ -27,7 +26,8 @@ import org.springframework.transaction.annotation.Transactional
 class CategoryService(
     private val categoryPort: CategoryPort,
     private val categoryImagePort: CategoryImagePort,
-    private val contentPort: ContentPort
+    private val contentPort: ContentPort,
+    private val sharedCategoryPort: SharedCategoryPort
 ) : CategoryUseCase {
     companion object {
         private const val MAX_CATEGORY_COUNT = 30
@@ -154,6 +154,22 @@ class CategoryService(
         contentPort.duplicateContent(originCategoryId, newCategory.categoryId)
     }
 
+    @Transactional
+    override fun acceptCategory(userId: Long, categoryId: Long) {
+        val category = categoryPort.loadByIdOrThrow(categoryId)
+
+        sharedCategoryPort.loadByUserIdAndCategoryId(userId, categoryId)
+            ?.let { throw ClientValidationException(CategoryErrorCode.ALREADY_ACCEPTED) }
+
+        category.addUserCount()
+        category.shared()
+
+        categoryPort.persist(category)
+
+        val sharedCategory = SharedCategory(userId = userId, categoryId = category.categoryId)
+        sharedCategoryPort.persist(sharedCategory)
+    }
+
     override fun getAllCategoryImages(): List<CategoryImage> =
         categoryImagePort.loadAll()
 
diff --git a/domain/src/main/kotlin/com/pokit/category/exception/CategoryErrorCode.kt b/domain/src/main/kotlin/com/pokit/category/exception/CategoryErrorCode.kt
index 9b0d9f1e..30d7a94c 100644
--- a/domain/src/main/kotlin/com/pokit/category/exception/CategoryErrorCode.kt
+++ b/domain/src/main/kotlin/com/pokit/category/exception/CategoryErrorCode.kt
@@ -14,5 +14,6 @@ enum class CategoryErrorCode(
     NOT_FOUND_UNCATEGORIZED_IMAGE("미분류 카테고리 이미지를 찾는데 실패했습니다.", "CA_006"),
     SHARE_ALREADY_EXISTS_CATEGORY("직접 생성한 포킷은 공유받을 수 없습니다.\n 다른 유저의 포킷을 공유받아보세요.", "CA_007"),
     NOT_FOUND_UNCATEGORIZED("사용자가 미분류 카테고리가 없습니다.(서버 에러)", "CA_008"),
+    ALREADY_ACCEPTED("이미 초대를 수락한 포킷입니다.", "CA_009"),
 
 }
diff --git a/domain/src/main/kotlin/com/pokit/category/model/Category.kt b/domain/src/main/kotlin/com/pokit/category/model/Category.kt
index b8b4534d..f7a312f5 100644
--- a/domain/src/main/kotlin/com/pokit/category/model/Category.kt
+++ b/domain/src/main/kotlin/com/pokit/category/model/Category.kt
@@ -10,6 +10,8 @@ data class Category(
     var contentCount: Int = 0,
     val createdAt: LocalDateTime = LocalDateTime.now(),
     var openType: OpenType,
+    var userCount: Int = 0,
+    var isShared: Boolean = false,
 ) {
     fun update(categoryName: String, categoryImage: CategoryImage) {
         this.categoryName = categoryName
@@ -20,6 +22,14 @@ data class Category(
         this.openType = OpenType.PUBLIC
         return this
     }
+
+    fun addUserCount() {
+        this.userCount++
+    }
+
+    fun shared() {
+        this.isShared = true
+    }
 }
 
 data class RemindCategory(
diff --git a/domain/src/main/kotlin/com/pokit/category/model/SharedCategory.kt b/domain/src/main/kotlin/com/pokit/category/model/SharedCategory.kt
new file mode 100644
index 00000000..e570dd89
--- /dev/null
+++ b/domain/src/main/kotlin/com/pokit/category/model/SharedCategory.kt
@@ -0,0 +1,7 @@
+package com.pokit.category.model
+
+data class SharedCategory(
+    val id: Long = 0,
+    val userId: Long,
+    val categoryId: Long
+)