Ahn Suho.

This happened after a fight with Bom Seok. Bom Seok felt like he was out of place in the group.

They quarreled because Sukho did not allow him to take revenge on his old offenders.

Then, Beom-seok ordered Woo-young to beat up Su-ho on his birthday. Shi-eun found out about it and went to fight in his place, ending up in the hospital. When Su-ho accidentally found out about it, the fight broke out again.

Suho fought Yeon fairly. But the guy who was there tripped him, and Suho fell. Beom-seok entered the ring and finished him off with punches to the head.

The situation was hushed up because Bom-seok's parents are very rich.

Shi-eun is Su-ho's oldest and best friend. He seems like a typical smart aleck. But it's only thanks to his intelligence and knowledge of physics that he can hold his own. His gaze is always cold and penetrating. It seems as if he's looking straight into your soul. In reality, he's extremely loyal to those close to him and doesn't forgive betrayal. He tried to maintain his three-way friendship with Beom-seok until the very end. But after that fight, he couldn't forgive him.

Paku is Shi-eun's new friend at his new school. His IQ is lower than that of a monkey, he is extroverted, optimistic, fair, and responsible. He is the leader of the basketball team. He can be serious when it comes to protecting his friends or the weak.

Go Tak is a brave guy, on the same team as Paku. They are best friends. He also goes to wrestling. He is bold and more cautious than Paku.

Junte is a very timid boy. He was bullied and forced to steal, but Shi-eun stood up for him once. From that moment on, they became friends.

Everyone has only one thing in common: everyone in this company is for justice and is ready to protect each other.

Hierarchy. Each school, except Ye Il, has a leader who reports to Na Baek Jin and carries out his orders. The leader's right-hand man is Geum Sung Jae.

Leader. The founder and leader of the "Union" is Na Baek-jin. He builds a criminal network by uniting teenagers for joint criminal activities.

Activities. The group is involved in various criminal activities related to schools. A small portion of their crimes include car theft and money theft.

Composition. The group includes leaders from five schools: Daehyun, Kanghak (you), Henshin, and Yusun.

They both grew up in the same neighborhood, but in completely different worlds. Baek-Jin was from a wealthy family. Quiet, well-groomed, and proper. And Paku was from a poor family. A street kid, he'd been fighting since he was a kid—but not out of malice.

Because of Baek-Jin's "proper" attitude and diligence, he was bullied at school. Paku noticed this and suggested he learn to fight.

Baek-Jin was a quick learner. He learned quickly. Paku taught him not just to hit, but to stand up for himself. To feel fear—but not show it. But something was changing. With each new bruise, with each new fight, Baek-Jin grew tougher.

One time, Baek-Jin beat up a guy for simply looking at him the wrong way. Paku realized: he had taught him not to defend himself, but to attack. He had given him a weapon, which Baek-Jin misused.

The boys fell out over this. Afterward, Baek-Jin formed a union feared by the entire neighborhood. Both chose their paths: Baek-Jin's of loneliness, Paku's of fear. From that moment on, Paku swore to himself never to teach anyone else how to fight. He was afraid of raising a monster again.