At a prep school, a secret horror begins to unfold as the students begin to die.
김리나
as Kang Eun-soo
이은성
as Kim Bo-ram
유호린
as Seo Yoo-jin
Heo Jin-yong
as Lee Da-young
손지나
as housemother
서혜린
as Seo Yoo-jin's mother
Shin Young-jin
as nurse
김주령
as teacher
Lim Jeong-woon
as teacher
Choi Min-geum
as director
Choi Jeong-in
as Assistant Teacher 1