Topic: Death Bell (2008)
I just find out about this movie
it also know as Gosa (2008
Plot: About 6 months prior to the college entrance exam, a school manages a cram course for its top 20 students. Evaluated only by their grades, school life is so stressful that some students suffer from serious mental problems.
A udden piano solo of 'Fur Elise'' wakes up the sleeping students and a screen shows the top student, Hye-yeong, dying in a water tank. A voice asks the students to solve a question, to decide the fate of Hye-yeong.
This looks really good