A class of students stays at school for a camp in an elite study group to finesse theirs and the school's grades. Upon the first night, the swimming coach is found murdered. As the students try to figure out what happens, a voice informs them that if they don't figure the murder out, students will begin dying in quick succession.
as Cha Seon-sang
as Eun-su
as Se-hee
as Kwan-woo
as Na-rae
as Soo-il
as Tae-yeon
as Ji-yoon
as Hyeon-a
as Yong-ran
as Jung-bum
as JK
as Geun-sik
as Won-ho
as Teacher Kang
as Min-jeong
as Kyung-hee
as Ji-ae
as Jung-bum's Mother
