Weak hero.

The main character is Yeon Si-eun. He is a model student who is solely focused on his studies and ranks in the top 1% of his class. However, he is physically weak, making him a target for the school bullies, led by Jeon Yong-bin.

Instead of passing the ball, Si-eun uses what he has: a sharp mind, knowledge of psychology and physics, and an ability to analyze the situation and his surroundings. He develops cunning strategies to defend and even counterattack.

Gradually, a support group forms around him. He becomes close with Ahn Soo-ho, the strongest fighter in the class, who also values ​​friendship and helps others. Also joining the group is Oh Beom-seok, a transfer student who himself was bullied before and therefore especially values ​​this new friendship. Together, the guys try to resist a system where violence is often the solution to problems. But the trials don't end there: serious conflicts arise, including with outside groups, and the heroes are forced to take risky steps.

Main character traits
An introvert and a loner, he maintains aloofness, makes no effort to make friends, and rarely shows emotion. His priorities are his studies and personal space.
High intelligence and analytical thinking. Shi-eun excels in her studies, ranks in the top 1% of her class, and in conflicts, she relies on calculation rather than force: she anticipates her opponents' actions, utilizes her knowledge of physics, and utilizes her surroundings.
A cold-blooded strategist. He doesn't pick a fight without a reason, but if forced to defend himself or a loved one, he acts harshly and deliberately, even to the point of carefully planned revenge.
A sense of justice with strict boundaries. He is outraged by injustice and bullying, but he is not an altruistic hero: he intervenes when it concerns him or those he cares about.
Emotionally vulnerable, yet stubborn. He appears cold on the outside, but inside he's deeply troubled, especially by guilt and the loss of friends. This pain makes him more determined, but also tougher.
Resilience and a willingness to pay a high price. He doesn't shy away from the pain and consequences of his decisions: he takes hits, takes risks, and doesn't look for easy ways out.

Physical confidence, emotional fatigue. Sukho trained in MMA and looks like he can hold his own. But in reality, he's exhausted by his circumstances: part-time jobs, a lack of support at home, and the constant need to keep up appearances.
Loyalty and protection of the weak. He becomes Yeon Shi-eun's support system and generally doesn't tolerate bullying: if he sees injustice, he intervenes, even when it's unfavorable.
Emotional restraint. He doesn't like to complain and tries to solve problems through action rather than talk. Because of this, others often don't realize how difficult things are for him.
A responsibility beyond his years. Suho is forced to mature early, so he takes on the role of the "strong guy" who will endure everything, even if he's scared or hurt inside.
Vulnerability due to loneliness. He has almost no safe place to be himself, and it is this emptiness that makes him weak not physically, but emotionally: he relies on a sense of duty and friendship, and when these crumble, he breaks more deeply than he seems.