As the killings continue and the tension rises among the students, Se-hee and her classmates realize that the killer is targeting them based on their darkest secrets and past actions. Each student is forced to confront their own demons and make difficult choices in order to survive.
As they race against time to solve the riddles and uncover the truth behind Tae-yeon's suicide, the students must also navigate the complex web of relationships and rivalries within the study camp. Betrayals and alliances are formed, and long-held secrets are exposed as the students fight for their lives.
As the body count rises and the stakes get higher, Se-hee must confront the ghosts of her past and find the strength to face the killer head-on. With time running out and the killer closing in, Se-hee and her classmates must work together to unravel the mystery and outsmart the killer before it's too late.