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.
Eun-a, who was living a happy life with her family, loses everything to a psychopath serial killer. After the tragic incident, she gathers four people with different talents who are in need of organ transplants to achieve her revenge.
Desperate for revenge, a young man enlists the aid of a medium to help him track down his sister's killer.
