South Korean horror in which an elite class of high school students face a potentially deadly examination. Much is expected of the students of the Seoul school led by head teacher Chang-wook Hwang (Beom-su Lee); so much so that Saturday study sessions are not unusual - though this one certainly turns out to be. A class including Yi-na Kang (Gyu-ri Nam) and her best friend, Myong-hyo Yoon (Son Yeo Eun), find themselves locked in an exam hall watching live video of fellow students in perilous situations. A voice informs them that if they do not answer various test questions correctly the students on the video will be killed. Those in the hall face a desperate test of their intellect as they strive to keep their endangered fellow students alive and attempt to work out who is torturing them.
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