Jung Jae-young

as Han Jung-seok

Han Ji-min

as Yoo So-jung

Kim Ji-young

as Psychiatrist

Cha Ye-ryun

as Lee Ji-won

Choi Won-young

as Kang Byung-soo

Hwang Byeong-gug

as Japanese researcher (uncredited)

Seong Byeong-suk

as Mi-young

Ha Jae-sook

as Lethargy woman

Park Gil-su

as Section chief Nam (uncredited)

Yoon Kyung-ho

as Drunk (uncredited)

Go Seo-hee

as (uncredited)

Kim Ji-hoon

as Deong-chi