Lim Soo-jung as Yoon-jung / So-eun

Cho Jung-seok as Ji-hwan

Lee Jin-uk as Detective Gun-woo

Jung Jin-young as Detective Kang

Lee Ki-woo as Detective Lee

On Ju-wan as Teacher Park

Lee Tae-ri as Kang Seung-bum

Chun Sin-hwan as Biology Teacher

Kim Bo-ra as Choi Hyeon-ju

Shin Ji-soo as Nice Schoolgirl

Jung Woong-in as Kang Hyeong-chul

Kim Won-jin as Detective Yeo-ju

Im Ye-jin as Vice Principal

Park Jun-gyu as Real Estate Man

Kang Bo-min as Hostage Woman

Yoon Byung-hee as Player

Han Hee-jung as Present Pickpocket Woman

Lee Sae-ro-mi as Teacher

Won Choi as High School Male Teacher