Victory High School is among the lowest-ranking of Seoul's 178 high schools; preparation is underway for an information session for prospective students and parents of the 2013 school year; Ko Nam Sun survived high school by keeping a low profile.

In Jae finds herself at loggerheads with the principal concerning the handling of the chair incident; Min Gi's mother, who's on the PTA, suggests that they change the homeroom teacher to Se Chan.

In Jae agrees to leave, and Se Chan agrees to be the homeroom teacher; this causes a ruckus and puts Nam Sun in a difficult position; Ha Gyeong is accused of stealing Gyeong Min's copy of the golden study guide.

The principal is flustered when school inspectors inquire about Se Chan giving illegal private lessons; there are rumors that Heung Su, the new transfer student, was the top dog in Gyeonggi-do.

Nam Sun, Heung Su, and Jeong Ho go to the police station with their faces black and blue; Jeong Ho finds out the secret Nam Sun has been trying to hide; the principal orders compulsory attendance of voluntary study hall.

A test sheet goes missing right before the midterm exams; In-jae and Se-chan set out to find the culprit; Jeong-ho, who's no longer the top dog in class, is bothered by Heung-su's presence; there are rumors about Nam-sun and Heung-su.