Casting | Rôle |
|---|
| Don Lee | Ba-woo |
| Seohyun | Sharon |
| Lee Da-wit | Kim Gun |
| 경수진 | Jung-won |
| Jung Zi-so | Eun-seo |
| Choi Gwang-il | Father Marco |
| 송요셉 | Middle-Aged Man |
| 박옥출 | Auntie |
| 한기중 | Chief of Police |
| 이다일 | Mysterious Man |
| 조혜연 | Female Guest |
| 윤지원 | Su-jin |
| 전세원 | Female Patient |
| 남권아 | Landlady |
| 박기선 | Landlord |
| 차우진 | CCTV Security Guy |
| 김소양 | CCTV Security Girl |
| 김도건 | Delivery Driver |
| 서문호 | Male Nurse 1 |
| 이선호 | Male Nurse 2 |
| Lee Sung-woo | Basement Demon 1 |
| 이재석 | Basement Demon 2 |
| Carla Fernanda Avila Escobedo | Hideout Informant |
| 이태영 | Thumbs-Up Guy |
| 이소윤 | Orphanage Child 1 |
| 김시우 | Orphanage Child 2 |
| 김우빈 | Orphanage Child 3 |
| 정하빈 | Orphanage Child 4 / Additional Children Voices 4 (voice) |
| 장우준 | Orphanage Child 5 |
| 임용순 | Pastor |
| 나경철 | Male Announcer (voice) |
| 이승민 | Female Announcer 1 (voice) |
| 김선영 | Female Announcer 2 (voice) |
| 이시형 | Hospital Security Guard |
| 이원행 | Hospital Patient 1 / Hallway Worshipper 1 |
| 정윤성 | Hospital Patient 2 |
| 류성철 | Hospital Patient 3 |
| 노재훈 | Hospital Patient 4 |
| 김지영 | Hospital Patient 5 |
| 김산성 | Hospital Patient 6 |
| 최홍락 | Hospital Patient 7 |
| 정경숙 | Sister Angela |
| 이재이 | Young Ba-woo |
| 김예겸 | Young Joseph |
| 이설이 | Young Sister Catalina |
| 김성동 | Young Father Marco |
| Mitch Craig | Junkie 1 |
| 이영준 | Junkie 2 |
| 안효훈 | Junkie 3 |
| 홍지우 | Junkie 4 |
| 리에 | Junkie 5 |
| 김기수 | Junkie 6 |
| 선우 | Junkie 7 |
| 임서아 | Junkie 8 |
| 이서경 | Junkie 9 |
| 하유리 | Junkie 10 |
| 김정길 | Junkie 11 |
| 선승민 | Junkie 12 |
| 도유리 | Junkie 13 |
| 이정우 | Junkie 14 |
| 김지선 | Junkie 15 |
| 이지영 | Junkie 16 |
| 이동규 | Junkie 17 |
| 육예주 | Junkie 18 |
| 조정빈 | Junkie 19 |
| 조유진 | Junkie 20 |
| 송희주 | Junkie 21 |
| 최이재 | Junkie 22 |
| 이다령 | Junkie 23 |
| 이현진 | Junkie 24 |
| 권혜원 | Junkie 25 |
| 송지훈 | Junkie 26 |
| 서우희 | Junkie 27 |
| 박은철 | Junkie 28 |
| 황태희 | Junkie 29 |
| 신지인 | Mentally Ill Person / Possessed Person |
| 김수우 | Paramedic |
| 이건구 | Hideout Demon 1 |
| 맹승영 | Hideout Demon 2 |
| 권지훈 | Hideout Worshipper 1 |
| 김석진 | Hideout Worshipper 2 |
| 박건희 | Hideout Worshipper 3 |
| 조승연 | Hideout Worshipper 4 |
| 황영윤 | Hideout Worshipper 5 |
| 윤기현 | Hideout Worshipper 6 |
| 정신영 | Hideout Worshipper 7 |
| 박주원 | Pathologist's Assistant / Basement Worshipper 4 |
| 문경린 | Pathologist / Hallway Worshipper 3 |
| 김진우 | Hallway Worshipper 2 |
| 박승진 | Hallway Worshipper 4 |
| 김예성 | Hallway Worshipper 5 / Basement Worshipper 2 |
| 민선기 | Spying Worshipper |
| 지륜 | Basement Worshipper 1 |
| Kim Tae Yoon | Basement Worshipper 5 |
| 김우람 | Basement Worshipper 6 |
| Yoon Jin-yul | Chapel Worshipper 1 |
| 현승환 | Chapel Worshipper 2 |
| Nandin-Erdene Boldbaatar | Chapel Worshipper 3 / Basement Worshipper 3 |
| 박현준 | Chapel Worshipper 4 |
| 김도훈 | Chapel Worshipper 5 |
| 정아준 | Chapel Worshipper 6 |
| 유성곤 | Chapel Worshipper 7 |
| 조창근 | Chapel Worshipper 8 |
| 양남욱 | Chapel Worshipper 9 |
| 박종민 | Chapel Worshipper 10 |
| 황대현 | Joseph |
| 조현겸 | Monstrous Entity (voice) |
| 강성욱 | Eun-seo's Demon Form (voice) |
| 최진호 | Moloch (voice) |
| 김남현 | Additional Male Voices 1 (voice) |
| 황상조 | Additional Male Voices 2 (voice) |
| 왕희정 | Additional Male Voices 3 (voice) |
| 염승철 | Additional Male Voices 4 (voice) |
| 안정호 | Additional Male Voices 5 (voice) |
| 문은지 | Additional Female Voices 1 (voice) |
| 박소현 | Additional Female Voices 2 (voice) |
| 최재은 | Additional Female Voices 3 (voice) |
| 이재빈 | Additional Children Voices 1 (voice) |
| 이주원 | Additional Children Voices 2 (voice) |
| 송재윤 | Additional Children Voices 3 (voice) |
| Ryu Seung-soo | Detective Choi |
| Jeon Ik-ryoung | Sister Catalina |
