Seungri High School ranks as one of the worst of the 178 high schools in Seoul based on academic scores. Seungri High School is now busy preparing presentations for its new students. Class 2 is at the bottom of grade 2 at Seungri High. Nam-Soon (Lee Jong-Suk) is elected class president for grade 2, thanks to the support of Jung-Ho (Kwak Jung-Wook), who is a member of the school gang.
Se-Chan (Daniel Choi) is the top Korean language teacher at a famous institute in Gangnam. In order to improve the student's scores at Seungri High School, the school hires Se-Chan. When Se-Chan appears at the school's opening presentation, Nam-Soon becomes embarrassed.