Class of Lies

Mu Hyuk is in charge of defending Kim Han Su, the suspect of the attempted murder. According to the circumstances, Han Su is the only one who has a motive and chance to kill Su Ah. However, Han Su insists that he is not the criminal. Mu Hyuk wants Han Su to give him evidence to believe his assertion, and Han Su says that Su Ah is his girlfriend.

Destroyed and defamed, Gi Mu Hyeok returns as a teacher and infiltrates Cheonmyung High School to uncover the truth behind Jung Su Ah's death. On his way to school for the start of the semester, he sees Ha So Hyun in an embarrassing situation. Meanwhile, the kids at the school plan a bare-knuckle fight on the rooftop of the school.

Late at night, Gi Kang Je and Yu Beom Jin meet for the first time in a strange ordeal dealing with Ahn Byung Ho on the rooftop of Cheonmyung High School. Although they resolve the situation, Beom Jin leaves Kang Je with a little insight into the school. Kang Je starts to notice suspicious things all over the school and gets a little closer to finding out the truth behind the murder. Meanwhile, So Hyun worries over Byung Ho getting bullied in and out of school.