On a Saturday, 170 days before college entrance exam, a special class for 20 top students is held atschool. The only other people left in school together with the 20 students are: the popular teacherChang-wook, the new English teacher So-young, and the student manager Chi-young. But in the middleof class, “for Elise” rings from the speaker and the TV in classroom shows the top student Hye-youngtrapped in the water rising tank, screaming and struggling to breathe. And an unidentified voice asksthe answer to a mid-term exam question that will cost Hye-young’s life. Nowhere to run, and only 20students and 3 teachers are in school. The bloody exams start once again just for them.
