Yu-wol-ui il-gi

Two high school students, both new to the same class, meet their end on the same day. The top student is fatally stabbed on the street, while the second-ranking student appears to have leaped from the school’s rooftop. The prevailing assumption is that the latter killed his classmate before taking his own life. However, when the police discover small pill boxes inside the stomachs of both teenagers, confessing to their murders, two South Korean detectives find themselves embroiled in a fresh murder series. As they pursue the serial killer, more students fall victim…