DEATH BELL

Death Bell is a 2008 South Korean horror film co-written and directed by Chang, and starring Lee Beom-soo, Yoon Jeong-hee, and Nam Gyoo-ri as I-na.

All the elite students, twenty of them, are taking special classes for their college entrance exam. After one of them is almost strangled and disappears in the restroom's ceiling, the schools' TV screens switch to the image of one of the top-ranking student who is caged inside a fish tank that is being slowly filled with water. Later, a strange voice on the intercom announces that her life depends on the answers to an exam that students will have to pass, and that if they cannot answer, a student will die for every wrong answer they get. Trapped inside the school with the students, two teachers, the head teacher and the English are trying to keep students calmed while thinking of a solution to their problem. After some students continue disappearing, and eventually dying, I-na, one of the students, gets away from the group of students and manages to discover that they are being killed in order of their rank in the class, and she is going to be the fifth to be killed. It seems that all the current events are linked to the death of one of the top students who die two years ago. It is then I-na and the teachers' duty to help everybody get out of the school alive.