Jeon Do-yeon

as Gil Bok-soon

Sul Kyung-gu

as Cha Min-kyu

Kim Si-a

as Gil Jae-young

Esom

as Cha Min-hee

Koo Kyo-hwan

as Han Hee-sung

Kim Seung-o

as Shin

Lee Yeon

as Kim Young-ji

Hwang Jung-min

as Kim Gwang-il / Shinichiro Oda

Choi Byung-mo

as Hyun-chul

Kim Ki-cheon

as Su-guen

Park Kwang-jae

as Gwang-man

Jang In-sub

as Yoon-sub

Jang Hyun-sung

as Bok-soon's Father

Lee Jae-wook

as Young Cha Min-kyu

Lee Hae-yeong

as Oh Jung-sik

Ki Joo-bong

as Ki

Kim Joon-bae

as Bae

Lee Young-suk

as Suk

Kim Yong-jun

as Yong

Park Se-hyun

as Young Gil Bok-soon

Im Jae-in

as Lee So-ra

Choi Hyung-joo

as Yoo Cheol-woo

Lee Seung-yeon

as So-ra's Mother

Kim Jae-hwa

as Cheol-woo's Mother

Yoon Kyung-ho

as Principal

Jo Hyun-wu

as Detective

Kim Hyun-jae

as Kyung-pyo

Yoon Se-woong

as Announcer

Lee Ru-ahn

as Teacher

Ahn Seong-bong

as M.K Information Desk Staff

Kim Dae-han

as M.K. Writer

Choi Yoon-bin

as Corpse Cleaner 2

Park Geun-jeong

as Killer

Sin Chae-rin

as First Class Lounge Child

Shin Kang-kyun

as Killer