In a prep-class for year-end exams, a sadistic killer puts the students through mind-games in order to save each other.
Hwang Chang-wook
Choi So-yeong
Kang Yi-na
Kang Hyeon
Yoon Myung-hyo
Security guard
Ji-won's mother
Lee Chi-yeong
Kim Ji-won
Min Hye-yeong
Yeom Ji-hyang
Cha Jae-wook
Jo Beom
Myung-hyo's mother
Park Hyun-gyeong
Kim Hyung-jin
