Three teenage boys, Shin Yong-joo, Han Ki-woong and Ko Ki-taek, were best friends in middle school. While Yong-joo and Ki-taek still remain close, Ki-woong becomes a ''jjang'' (Korean slang term meaning "best"), one of the strongest fighters in the school, and begins to hang out with Sung-jin's gang (Sung-jin's parents are powerful figures, making him a bigwig among his schoolmates), meaning he draws away from the other two, particularly when Yong-joo becomes concerned when he finds out that Sung-jin's gang is mercilessly bullying Ki-taek, an eccentric manhwa fan.