Seon-dong Yu, and starring Jeong-eum Hwang, Su-ro Kim and Hyeon-sang Kwon. The film is a sequel, although in name only, to the 2008 film Death Bell.
Two years after a student is found dead by the swimming pool, her step-sister is still haunted by nightmares and terrible visions. During summer some elite students are selected to participate in a program inside the school to take college-like courses. But the first night, the swimming trainer is murdered in the showers and a mysterious voice warns the students that they will all be killed. The only condition to survive is if they can answer who the murderer is and his/her motives.