diff --git a/src/main/java/roomescape/common/exception/ErrorType.kt b/src/main/java/roomescape/common/exception/ErrorType.kt
index 4cb5a16b..cf340e70 100644
--- a/src/main/java/roomescape/common/exception/ErrorType.kt
+++ b/src/main/java/roomescape/common/exception/ErrorType.kt
@@ -1,9 +1,5 @@
 package roomescape.common.exception
 
-import com.fasterxml.jackson.annotation.JsonCreator
-import com.fasterxml.jackson.annotation.JsonProperty
-import org.springframework.http.HttpStatus
-
 enum class ErrorType(
         val description: String
 ) {
@@ -54,18 +50,4 @@ enum class ErrorType(
     PAYMENT_ERROR("결제(취소)에 실패했습니다. 결제(취소) 정보를 확인해주세요."),
     PAYMENT_SERVER_ERROR("결제 서버에서 에러가 발생하였습니다. 잠시 후 다시 시도해주세요.")
     ;
-
-    companion object {
-        @JvmStatic
-        @JsonCreator
-        fun from(@JsonProperty("errorType") errorType: String): ErrorType {
-            return entries.toTypedArray()
-                    .firstOrNull { it.name == errorType }
-                    ?: throw RoomescapeException(
-                            INVALID_REQUEST_DATA,
-                            "[ErrorType: ${errorType}]",
-                            HttpStatus.BAD_REQUEST
-                    )
-        }
-    }
 }
diff --git a/src/main/java/roomescape/member/web/MemberDTO.kt b/src/main/java/roomescape/member/web/MemberDTO.kt
index 8b8b4e32..d7bf3e61 100644
--- a/src/main/java/roomescape/member/web/MemberDTO.kt
+++ b/src/main/java/roomescape/member/web/MemberDTO.kt
@@ -15,14 +15,7 @@ data class MemberResponse(
 
         @field:Schema(description = "회원의 이름")
         val name: String
-) {
-    companion object {
-        @JvmStatic
-        fun fromEntity(member: MemberEntity): MemberResponse {
-            return MemberResponse(member.id!!, member.name)
-        }
-    }
-}
+)
 
 @Schema(name = "회원 목록 조회 응답", description = "모든 회원의 정보 조회 응답시 사용됩니다.")
 data class MembersResponse(
diff --git a/src/main/java/roomescape/reservation/web/ReservationResponse.kt b/src/main/java/roomescape/reservation/web/ReservationResponse.kt
index 6988a387..8e370416 100644
--- a/src/main/java/roomescape/reservation/web/ReservationResponse.kt
+++ b/src/main/java/roomescape/reservation/web/ReservationResponse.kt
@@ -67,21 +67,7 @@ data class ReservationResponse(
 
         @field:Schema(description = "예약 상태", type = "string")
         val status: ReservationStatus
-) {
-    companion object {
-        @JvmStatic
-        fun from(reservation: ReservationEntity): ReservationResponse {
-            return ReservationResponse(
-                    reservation.id!!,
-                    reservation.date,
-                    reservation.member.toResponse(),
-                    reservation.reservationTime.toResponse(),
-                    reservation.theme.toResponse(),
-                    reservation.reservationStatus
-            )
-        }
-    }
-}
+)
 
 fun ReservationEntity.toResponse(): ReservationResponse = ReservationResponse(
         id = this.id!!,
diff --git a/src/main/java/roomescape/reservation/web/ReservationTimeDTO.kt b/src/main/java/roomescape/reservation/web/ReservationTimeDTO.kt
index c0a5a23e..c98deef2 100644
--- a/src/main/java/roomescape/reservation/web/ReservationTimeDTO.kt
+++ b/src/main/java/roomescape/reservation/web/ReservationTimeDTO.kt
@@ -17,15 +17,7 @@ data class ReservationTimeResponse(
 
         @field:Schema(description = "예약 시간", type = "string", example = "09:00")
         val startAt: LocalTime
-) {
-
-    companion object {
-        @JvmStatic
-        fun from(reservationTime: ReservationTimeEntity): ReservationTimeResponse {
-            return ReservationTimeResponse(reservationTime.id!!, reservationTime.startAt)
-        }
-    }
-}
+)
 
 fun ReservationTimeEntity.toResponse(): ReservationTimeResponse = ReservationTimeResponse(
         this.id!!, this.startAt
diff --git a/src/main/java/roomescape/theme/web/ThemeDTO.kt b/src/main/java/roomescape/theme/web/ThemeDTO.kt
index bb7e4d2b..a2940b6a 100644
--- a/src/main/java/roomescape/theme/web/ThemeDTO.kt
+++ b/src/main/java/roomescape/theme/web/ThemeDTO.kt
@@ -37,14 +37,7 @@ data class ThemeResponse(
 
         @field:Schema(description = "테마 썸네일 이미지 URL")
         val thumbnail: String
-) {
-    companion object {
-        @JvmStatic
-        fun from(themeEntity: ThemeEntity): ThemeResponse {
-            return ThemeResponse(themeEntity.id!!, themeEntity.name, themeEntity.description, themeEntity.thumbnail)
-        }
-    }
-}
+)
 
 fun ThemeEntity.toResponse(): ThemeResponse = ThemeResponse(
         id = this.id!!,