In a prep-class for year-end exams, a sadistic killer puts the students through mind-games in order to save each other.
Ли Бом-су
Hwang Chang-wook
윤정희
Choi So-yeong
남규리
Kang Yi-na
Ким Сан Бом
Kang Hyeon
손여은
Yoon Myung-hyo
이얼
Security guard
Kim So-hee
Ji-won's mother
공정환
Lee Chi-yeong
함은정
Kim Ji-won
Yang Ji-won
Min Hye-yeong
Lee Chae-won
Yeom Ji-hyang
권현상
Cha Jae-wook
손호준
Jo Beom
최인숙
Myung-hyo's mother
