Kim Ji-soo

as Yong-bi

Suho

as Sang-woo

Ryu Jun-yeol

as Ji-gong

Kim Hee-chan

as Doo-man

Kim Dong-wan

as Yong-bi's Older Brother

Kim Jong-soo

as Chief Oh

Choi Jun-young

as Detective Choi

Lee Joo-sil

as Sang-woo's Grandmother

Moon Hee-kyung

as Ji-gong's Mother

Yoo Ha-bok

as Doo-man's Father

Lee Ji-yeon

as Park Eun-hye

Jeong Do-won

as Detective Baek

Kang Jun-seok

as Paramedic

Han Hye-ji

as Nurse