As Chae-young navigates her new school, she discovers that it is ruled by a group of vicious bullies known as the F4. Determined to stand up against their tyranny, Chae-young takes on the F4 one by one, using her martial arts skills to defeat them and protect her classmates.
As Chae-young's reputation as a righteous fighter grows, she attracts the attention of the school's martial arts club, led by a mysterious and enigmatic figure known only as "The Master." The Master takes Chae-young under his wing and trains her to become an even stronger fighter, pushing her to her limits in order to unlock her full potential.
Meanwhile, Jong-gu becomes determined to prove himself and stand up to the bullies as well, inspired by Chae-young's bravery and strength. Together, Chae-young and Jong-gu form an unlikely alliance as they take on the F4 and challenge the status quo at Justice High.
As the tension escalates and the stakes grow higher, Chae-young must confront her own past traumas and fears in order to truly become the hero that Justice High needs. With the support of her friends and allies, Chae-young must find the courage to face her enemies head-on and bring justice to her school once and for all.