4th Period Mystery

4th Period Mystery Hangul4 RR4Gyoshi Churiyeongyeok , released internationally as The Clue, is a 2009 South Korean thriller film starring Yoo Seungho and Kang Sora.

Junghoon Yoo Seungho is the best student at his school. His rival, Taegyu Jo Sanggeun, takes any and every opportunity to knock him down both verbally and physically, and the two are known enemies amongst the other students. One afternoon Taegyu pushes Junghoon too far and the latter threatens Taegyu with a knife, an act thats witnessed by another student. Junghoon walks away from the situation, but shortly after the beginning of 4th period class he returns to find Taegyu dead. The boy has been stabbed repeatedly, and still in shock, Junghoon picks up the bloody knife off a nearby desk just as Dajung Kang Sora shows up, catching him in a most incriminating position. Fortunately for him, she not only believes his innocence, but offers to help him to solve the mystery and catch the real killer a task made particularly urgent by the fact that inminutes the rest of the class will return and the body will be discovered. The pair set out in search of the murderer and soon discover that just about everyones a suspect and even more unsettling, the murderer is now after them as well.

Source: Wikipedia