diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
index c835d0d..83f49bd 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupFacade.kt
@@ -4,9 +4,11 @@ import arrow.fx.coroutines.parZip
 import com.hero.alignlab.common.extension.executes
 import com.hero.alignlab.config.database.TransactionTemplates
 import com.hero.alignlab.domain.auth.model.AuthUser
+import com.hero.alignlab.domain.group.model.response.GetGroupResponse
 import com.hero.alignlab.domain.group.model.response.JoinGroupResponse
 import com.hero.alignlab.exception.ErrorCode
 import com.hero.alignlab.exception.InvalidRequestException
+import com.hero.alignlab.exception.NotFoundException
 import org.springframework.stereotype.Service
 
 @Service
@@ -71,4 +73,22 @@ class GroupFacade(
             )
         }
     }
+
+    suspend fun getGroup(user: AuthUser, groupId: Long): GetGroupResponse {
+        return parZip(
+            { groupService.findByIdOrThrow(groupId) },
+            { groupUserService.existsByGroupIdAndUid(groupId, user.uid) },
+        ) { group, includeGroup ->
+            if (!includeGroup) {
+                throw NotFoundException(ErrorCode.NOT_FOUND_GROUP_ERROR)
+            }
+
+            GetGroupResponse.from(group).run {
+                when (group.ownerUid == user.uid) {
+                    true -> this
+                    false -> this.copy(joinCode = null)
+                }
+            }
+        }
+    }
 }
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupService.kt b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupService.kt
index de0a5ed..05357e2 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupService.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/application/GroupService.kt
@@ -6,7 +6,9 @@ import com.hero.alignlab.domain.auth.model.AuthUser
 import com.hero.alignlab.domain.group.domain.Group
 import com.hero.alignlab.domain.group.infrastructure.GroupRepository
 import com.hero.alignlab.domain.group.model.request.CreateGroupRequest
+import com.hero.alignlab.domain.group.model.request.UpdateGroupRequest
 import com.hero.alignlab.domain.group.model.response.CreateGroupResponse
+import com.hero.alignlab.domain.group.model.response.UpdateGroupResponse
 import com.hero.alignlab.event.model.CreateGroupEvent
 import com.hero.alignlab.exception.ErrorCode
 import com.hero.alignlab.exception.InvalidRequestException
@@ -48,12 +50,37 @@ class GroupService(
         return CreateGroupResponse.from(createdGroup)
     }
 
+    suspend fun updateGroup(user: AuthUser, id: Long, request: UpdateGroupRequest): UpdateGroupResponse {
+        val group = findByIdAndOwnerUidOrThrow(id, user.uid)
+
+        val updatedGroup = txTemplates.writer.executes {
+            group.apply {
+                this.name = request.name
+                this.description = request.description
+                this.isHidden = request.isHidden
+                this.joinCode = request.joinCode ?: UUID.randomUUID().toString().replace("-", "")
+            }.run { groupRepository.save(this) }
+        }
+
+        return UpdateGroupResponse.from(updatedGroup)
+    }
+
     suspend fun existsByName(name: String): Boolean {
         return withContext(Dispatchers.IO) {
             groupRepository.existsByName(name)
         }
     }
 
+    suspend fun findByIdAndOwnerUidOrThrow(id: Long, ownerUid: Long): Group {
+        return findByIdAndOwnerUid(id, ownerUid) ?: throw NotFoundException(ErrorCode.NOT_FOUND_GROUP_ERROR)
+    }
+
+    suspend fun findByIdAndOwnerUid(id: Long, ownerUid: Long): Group? {
+        return withContext(Dispatchers.IO) {
+            groupRepository.findByIdAndOwnerUid(id, ownerUid)
+        }
+    }
+
     suspend fun findByIdOrThrow(id: Long): Group {
         return findByIdOrNull(id) ?: throw NotFoundException(ErrorCode.NOT_FOUND_GROUP_ERROR)
     }
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/domain/Group.kt b/src/main/kotlin/com/hero/alignlab/domain/group/domain/Group.kt
index b63f85b..3090458 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/domain/Group.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/domain/Group.kt
@@ -11,17 +11,17 @@ data class Group(
     val id: Long = -1,
 
     @Column(name = "name")
-    val name: String,
+    var name: String,
 
     @Column(name = "description")
-    val description: String?,
+    var description: String?,
 
     @Column(name = "owner_uid")
     var ownerUid: Long,
 
     @Column(name = "is_hidden")
-    val isHidden: Boolean,
+    var isHidden: Boolean,
 
     @Column(name = "join_code")
-    val joinCode: String
+    var joinCode: String
 ) : BaseEntity()
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/infrastructure/GroupRepository.kt b/src/main/kotlin/com/hero/alignlab/domain/group/infrastructure/GroupRepository.kt
index 73baa85..e5c460c 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/infrastructure/GroupRepository.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/infrastructure/GroupRepository.kt
@@ -9,4 +9,6 @@ import org.springframework.transaction.annotation.Transactional
 @Transactional(readOnly = true)
 interface GroupRepository : JpaRepository<Group, Long> {
     fun existsByName(name: String): Boolean
+
+    fun findByIdAndOwnerUid(id: Long, ownerUid: Long): Group?
 }
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/model/request/UpdateGroupRequest.kt b/src/main/kotlin/com/hero/alignlab/domain/group/model/request/UpdateGroupRequest.kt
new file mode 100644
index 0000000..eda5f98
--- /dev/null
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/model/request/UpdateGroupRequest.kt
@@ -0,0 +1,12 @@
+package com.hero.alignlab.domain.group.model.request
+
+data class UpdateGroupRequest(
+    /** 그룹명, 중복 불가능 */
+    val name: String,
+    /** 그룹 설명 */
+    val description: String?,
+    /** 숨김 여부 */
+    val isHidden: Boolean,
+    /** 참여 코드, 미입력시 자동 생성 */
+    val joinCode: String?,
+)
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/model/response/GetGroupResponse.kt b/src/main/kotlin/com/hero/alignlab/domain/group/model/response/GetGroupResponse.kt
new file mode 100644
index 0000000..c916f55
--- /dev/null
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/model/response/GetGroupResponse.kt
@@ -0,0 +1,26 @@
+package com.hero.alignlab.domain.group.model.response
+
+import com.hero.alignlab.domain.group.domain.Group
+
+data class GetGroupResponse(
+    val id: Long,
+    val name: String,
+    val description: String?,
+    val ownerUid: Long,
+    val isHidden: Boolean,
+    /** 그룹장만 조회 가능 */
+    val joinCode: String?,
+) {
+    companion object {
+        fun from(group: Group): GetGroupResponse {
+            return GetGroupResponse(
+                group.id,
+                group.name,
+                group.description,
+                group.ownerUid,
+                group.isHidden,
+                group.joinCode
+            )
+        }
+    }
+}
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/model/response/UpdateGroupResponse.kt b/src/main/kotlin/com/hero/alignlab/domain/group/model/response/UpdateGroupResponse.kt
new file mode 100644
index 0000000..6e03dfe
--- /dev/null
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/model/response/UpdateGroupResponse.kt
@@ -0,0 +1,23 @@
+package com.hero.alignlab.domain.group.model.response
+
+import com.hero.alignlab.domain.group.domain.Group
+
+data class UpdateGroupResponse(
+    /** group id */
+    val id: Long,
+    /** 그룹명 */
+    val name: String,
+    /** 그룹 설명 */
+    val description: String?,
+) {
+    companion object {
+        fun from(group: Group): UpdateGroupResponse {
+            return UpdateGroupResponse(
+                id = group.id,
+                name = group.name,
+                description = group.description,
+            )
+        }
+    }
+}
+
diff --git a/src/main/kotlin/com/hero/alignlab/domain/group/resource/GroupResource.kt b/src/main/kotlin/com/hero/alignlab/domain/group/resource/GroupResource.kt
index 6a3b38b..c2c4a01 100644
--- a/src/main/kotlin/com/hero/alignlab/domain/group/resource/GroupResource.kt
+++ b/src/main/kotlin/com/hero/alignlab/domain/group/resource/GroupResource.kt
@@ -7,6 +7,7 @@ import com.hero.alignlab.domain.auth.model.AuthUser
 import com.hero.alignlab.domain.group.application.GroupFacade
 import com.hero.alignlab.domain.group.application.GroupService
 import com.hero.alignlab.domain.group.model.request.CreateGroupRequest
+import com.hero.alignlab.domain.group.model.request.UpdateGroupRequest
 import io.swagger.v3.oas.annotations.Operation
 import io.swagger.v3.oas.annotations.tags.Tag
 import org.springframework.http.MediaType
@@ -19,6 +20,17 @@ class GroupResource(
     private val groupService: GroupService,
     private val groupFacade: GroupFacade,
 ) {
+    /**
+     * - 속해 있는 그룹의 정보를 조회할 수 있다.
+     * - 그룹장의 경우, joinCode를 조회할 수 있다.(그룹원은 조회 불가.)
+     */
+    @Operation(summary = "그룹 조회")
+    @GetMapping("/api/v1/groups/{id}")
+    suspend fun getGroup(
+        user: AuthUser,
+        @PathVariable id: Long
+    ) = groupFacade.getGroup(user, id).wrapOk()
+
     @Operation(summary = "그룹 생성")
     @PostMapping("/api/v1/groups")
     suspend fun createGroup(
@@ -26,13 +38,28 @@ class GroupResource(
         @RequestBody request: CreateGroupRequest
     ) = groupService.createGroup(user, request).wrapCreated()
 
+    @Operation(summary = "그룹 수정하기")
+    @PutMapping("/api/v1/groups/{id}")
+    suspend fun updateGroup(
+        user: AuthUser,
+        @PathVariable id: Long,
+        @RequestBody request: UpdateGroupRequest
+    ) = groupService.updateGroup(
+        user = user,
+        id = id,
+        request = request
+    ).wrapOk()
+
     @Operation(summary = "그룹 탈퇴하기")
-    @PostMapping("/api/v1/groups/{id}/withdraw")
+    @DeleteMapping("/api/v1/groups/{id}/withdraw")
     suspend fun withdrawGroup(
         user: AuthUser,
         @PathVariable id: Long
     ) = groupFacade.withdraw(user, id).wrapVoid()
 
+    /**
+     * - 숨김처리된 그룹의 경우, joinCode가 입력되어야 접속 가능하다.
+     */
     @Operation(summary = "그룹 들어가기")
     @PostMapping("/api/v1/groups/{groupId}/join")
     suspend fun joinGroup(