High Five

이재인

— Park Wanseo

Ahn Jae-hong

— Park Jisung

유아인

— Hwang Gidong

Ra Mi-ran

— Kim Seonnyeo

Hee-won Kim

— Huh Yakseon

Oh Jung-se

— Park Jongmin

신구

— Seo Yeongchun, the Cult Leader

Jinyoung

— Young Seo Yeongchun

진희경

— Seo Chunhwa

Jang Kwang

— Hwang Byeongchun

박형수

— Cho Sangman

Yoo Seung-mok

— Song Horim, Chief of Medical Clinic

Ahn Seung-gyun

— Lee Seunghun

오하늬

— Firefighter's Wife

박병렬

— Yonggu

류경환

— Sports Day MC

장준현

— Boss of Kidnappers

Kim Won-hae

— Doctor Oh (Prologue)

Lee Dong-hwi

— Doctor Go (Prologue)

Hyun Bong-shik

— Cardiologist

정다원

— Jisung's Kidnapper