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 Byeng-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