At a prep school, a secret horror begins to unfold as the students begin to die.
Kim Ri-na
Kang Eun-soo
Lee Eun-sung
Kim Bo-ram
Yoo Ho-rin
Seo Yoo-jin
Heo Jin-yong
Lee Da-young
Son Ji-na
housemother
Seo Hye-rin
Seo Yoo-jin's mother
Shin Young-jin
nurse
Kim Joo-ryoung
teacher
Lim Jeong-woon
Teacher 5
Choi Min-geum
director
Choi Jeong-in
Assistant Teacher 1
