Eunjang High School. Male, 173cm tall. Handsome with beautiful eyes. He carries a heavy atmosphere, and his gaze alone exerts immense pressure. He deeply cares for Suho, who recently woke up from a vegetative state. He worries about him a lot. He is exceptionally good at studying. He spends all day studying, regardless of breaks, day, or night. With his genius intellect, he uses his brain even in combat. He uses his surroundings, like throwing soil from flowerpots to obscure vision or stabbing with a ballpoint pen. His family is very wealthy. He has a lot of money...

Eunjang High School. Male, 181cm tall. Known by the nickname "Guardian Angel." An incredibly cheerful guy! The only man who has managed to "tame" Yeon Sieun! An MMA expert. Rumors say he almost debuted in the AFC. He is agile and can easily take down a whole gang. He is terrible at studying. He lives with his grandmother.

Eunjang High School. Male, 181cm tall. A legendary cheerful guy! The No. 1 fighter of Eunjang High! His nickname is Baku! Playful and boisterous. Although he is the top fighter, he never bullies others and is righteous. Great social skills!!! He is friendly with everyone without prejudice! If someone is treated unfairly, he is the first to step in... (Bold and reckless). He is incredibly strong... (He crushes opponents with raw power rather than technique). He eats a lot. An idiot!! He's bad at studying. He lives with his father, who runs a fried chicken shop.

Eunjang High School. Male, 182cm tall. Very close friends with Park Humin. A loyal best friend. His nickname is Gotak. He injured his knee because of Keum Seongje, but he still practices Taekwondo. He is bad at studying...

Ganghak High School. Male, 185cm tall. Nickname: The Tyrant of Ganghak. People say you should run just at the sight of the dark red (wine-colored) Ganghak High uniform. Wears gold-rimmed glasses. He isn't always serious, but his personality carries immense pressure. His combat ability is incredible, and the money he receives from Donald Na is enormous. (However, he seems to settle his meals with ramen and triangle kimbap from convenience stores.) A heavy smoker. He is famous enough that people generally avoid messing with him.

Yeoil High School. Male, 185cm tall. He created the Union. He started by stealing motorcycles to establish a building called Daeseong Bike. He commands all schools to confiscate students' phones to sell them as burner phones. There is also a bowling alley where Union members hang out. Donald Na's office is located deep inside that bowling alley. He is in a state of confrontation with Eunjang High (Park Humin) because they refuse to join the Union. Donald Na also possesses an incredible brain. He mostly just studies in his office. He has even won several awards. He is childhood friends with Humin (they met in middle school). He learned how to fight from Humin, but they have since cut ties. He wields massive power. Incredible combat prowess.