Ga-min is passionate about studying and puts all his efforts into it. However, he never received a good grade, which made him go to Yusung Technical High School. The school is known as a gangster training school, and unlike Ga-min, not many students are into studying. However, Ga-min wants to try a new method of studying, which is forming a study group. He asks his classmate Se-hyun to join him, but he tells Ga-min about a problem he has.

Ga-min gets into an unexpected fight against Hyeon U, a school bully. As the fight goes on, the two become the center of attention of everyone in school. At that moment, a man enters the classroom that has become a mess because of the two, and it turns out that he is a school inspector. The vice-principal who got furious about the incident decides to expel Ga-min from school.