Seungri High School ranks as one of the worst of the 178 high schools in Seoul based on academic scores. Kang Se Chan is the top Korean language teacher who owns a famous teaching institute in Gangnam. Meanwhile, Jung In Jae is a short-term Korean language teacher at Seungri High who gets appointed as the homeroom teacher of class 2, the bottom of grade 2. When Se Chan transfers to Seungri High
