After Seon A falls from the school rooftop and slips into a coma, Ji Uk is consumed by guilt and rage. He teams up with Hyeon Heup to find the culprit. Meanwhile, Jeong U, an English teacher at Bangju High School, discovers his fiancée’s infidelity through a pair of S Line glasses left on his desk, unraveling his life and deepening the mystery. (thetvdb.com)