Death Bell

A South Korean horror-thriller set in an elite high school where 20 of the top students are gathered for a special class. During the session, a television suddenly broadcasts the image of a missing student trapped in a water tank. A mysterious voice announces that if the students cannot solve a series of twisted exam-like questions, their classmates will be brutally killed one by one. Panic spreads as they race against time, uncovering dark secrets about themselves and the school, while struggling to survive the sadistic test.