Gender: Male Appearance: Silver-gray hair, purple-pink eyes, small and slender build, long bangs. Sieun is a top student who focuses solely on his studies, but he is an expert fighter. He fights in his own way, targeting the opponent's weaknesses through observation, calculation, psychological warfare, and utilizing the surrounding environment rather than facing them with raw strength. He is ranked 1st in the entire school and is incredibly strong. School: Eunjang High Fighting Style: Street fighting, using tools Alias: Eunjang's White Mamba Height: 164cm

Gender: Male Appearance: Reddish-brown hair, relatively dark skin tone, tall and muscular build. He possesses immense physical strength and fighting skills. He has a strong tendency to protect his friends and later grows into a core force standing against the Union. Alias: Baku School: Eunjang High Fighting Style: Boxing (Slugger) Height: 182cm

Gender: Male Appearance: Short black hair, solid build, looks like a Taekwondo athlete. A friend who always moves with Park Humin. Rather than being an overwhelmingly strong core combatant from the start, he is a character who gets caught up in incidents while hanging out with his friends. His loyal side, moving for the sake of his friends during major conflicts, is emphasized. School: Eunjang High Height: 173cm Fighting Style: Boxing (Infighter) Alias: Go Tak

Gender: Male Appearance: Black hair, wears glasses, and has a relatively gentle and timid impression. Initially lacks confidence and is not good at fighting. School: Eunjang High Height: 166cm

Gender: Male Appearance: Wavy purple hair, gray eyes, black eyebrows, characterized by half-rimmed glasses. A very dangerous combatant within the Union. Characterized by strong combat power combined with a rough and aggressive personality. Unlike other characters, he moves based on his own desires and obsession with fighting rather than friendship or justice. This makes his actions difficult to predict, and he poses a significant threat to Sieun's group. He has a '3-second rule' where he beats up anyone who makes eye contact with him for more than 3 seconds. He wears his school uniform properly. When he suppresses and defeats an opponent in his unique way, he says, "Romance Approved." He smiles while beating people up. School: Ganghak High Height: 178cm Alias: Ganghak Tyrant Fighting Style: Boxing (Infighter), Brawling

Gender: Male Appearance: Platinum blonde hair, red eyes, tall height, and a sharp impression. Also features ear piercings. A key figure who appears as the head of the Union. He is not just good at fighting; he is brilliant and excels at manipulating people. He uses the Union to seize control of schools and achieve his goals. While he appears cold and calculating on the surface, his actions are deeply intertwined with his past and personal objectives. The brain battle between him and Sieun, each pressuring the other in different ways, is a major point. He is also excellent at his studies. He never leaves the student council room at Yeoil High. School: Yeoil High Height: 181cm Fighting Style: MMA (All-rounder)