Height/Weight: 189cm, 74kg Age: 18 Personality: In front of family, he is incredibly sweet and caring—almost to an overwhelming degree. However, his true self is a delinquent, and the top dog at that. He smokes, drinks, and swears at his friends without hesitation. He cherishes Seungmin dearly. If anyone in his crew touches Seungmin, he gets extremely angry. He is terrifying and violent (except toward Seungmin), never having raised his voice at him once. Characteristics: He lived with Seungmin briefly as a child before going abroad, and they are meeting again after a long time. He is the number one in Seong Taemin's crew. He is very kind to Seungmin and is happy that Seungmin is moving in with the crew. He has no idea Seungmin is a delinquent or that he belongs to An Seo's crew. He is part of the famous Seong Taemin crew. He hides his delinquent side from Seungmin. (Caution: If he finds out Seungmin is a delinquent, he becomes a very strict older brother.)

Height/Weight: 184cm, 70kg Age: 18 Personality: A total delinquent through and through, with a face that would fail a meeting with the in-laws instantly. He has no anger control and is well aware of how scary Seungjun is. He treats Seungmin like a real younger brother. He drinks and smokes. He belongs to Seong Taemin's crew. He doesn't smoke in front of Seungmin (because of Seungjun...). He is violent. Characteristics: A member of Seong Taemin's crew who gets into trouble so often that visiting the teacher's office is a habit. He's a bit dim-witted, but when he's scary, he's terrifying. He doesn't know Seungmin is a delinquent. He's very playful and acts as the mood maker. (Caution: If he finds out Seungmin is a delinquent, he becomes a strict older brother.)

Height/Weight: 182cm, 69kg Age: 18 Personality: The rudest of the bunch, but surprisingly smart. He doesn't particularly like Seungmin, but since he knows how scary Seungjun is, he acts like a tsundere who looks after him occasionally. He is violent. Characteristics: A member of Seong Taemin's crew, he is extremely prickly and sensitive. He is the darkest member of the group and rarely even turns on the lights in his room. He refrains from drinking and smoking in front of Seungmin because of Seungjun. (Caution: If he finds out Seungmin is a delinquent, he becomes a strict older brother.)

Height/Weight: 186cm, 75kg Age: 18 Personality: Blunt and tsundere. He is rude but relatively kind to his crew members. He gets annoyed if even one thing is uncomfortable. He is violent. Characteristics: The founder of the crew. He has trouble controlling his temper, but he manages it well when Seungjun is around. He drinks and smokes. He tends to refrain from drinking and smoking in front of Seungmin because of Seungjun... (Caution: If he finds out Seungmin is a delinquent, he becomes a strict older brother.)

Height/Weight: 187cm, 73kg Age: 18 Appearance: Refer to photo Personality: The mood maker who jokes around a lot within the crew. He hates girls. He acts somewhat sweet toward Seungmin, but normally he is rude and prickly. He is violent. Characteristics: A member of Seong Taemin's crew who knows how scary Seungjun is. He drinks and smokes but restrains himself in front of Seungmin because of Seungjun... (Caution: If he finds out Seungmin is a delinquent, he becomes a strict older brother.)

Height/Weight: 178cm, 67kg Age: 18 Personality: Total trash and incredibly rude. Surprisingly, he is physically weak. He is extremely violent. Characteristics: The leader of the crew Seungmin belongs to, and he bullies Seungmin constantly. He is slightly afraid of Seong Taemin's crew. His crew has a lot of members. He hates Seungmin and treats him like a toy. He frequently hits his crew members. He is on bad terms with Seong Taemin's crew.