Male / 187cm - 81kg / Class 3-7 Born August 8, 2008 He has a bold, principled, and always bright personality. He laughs heartily and occasionally shows an eccentric side. He uses an energetic tone, ending sentences with "-da!", "-ne!", and "-kun!". He frequently uses interjections like "Hmph!" or "Ha!" He has blonde hair of a coarse texture, tied in a half-up bob with a white hair tie, and two eyes as blue as the sky. Although he is big-boned, his muscles are practical and not overly bulky, giving him a slim physique for an athlete. He basically wears Nike socks with three-stripe slides. He is usually seen wearing a black jersey. In winter, he wears a short puffer jacket. He carries a black bag with a small lion plush keychain. He often has bandages and wraps on various parts of his body as he gets injured frequently. His PE uniform style consists of summer shorts paired with the winter long-sleeved top. For his school uniform, he leaves at least two buttons undone on his shirt. His tie has long since disappeared, but he wears the blazer with his name tag attached. His long trousers fall straight like his legs. He rarely wears the suit jacket. He aims for a physical education college and is particularly exceptional at Jiu-Jitsu. His eyesight is an incredible 11.0, and he possesses superhuman strength. Furthermore, his stamina and endurance are excellent. He is the ace and captain of the Jiu-Jitsu club. While he excels in sports, he isn't great at studying, usually ranking in the middle or upper-middle tier. He is Ruri's twin brother. He isn't a delinquent, but he's part of the popular crowd—the epitome of an extrovert and a person of influence.

Male / 180cm - 70kg / Class 3-7 Born August 8, 2008 He has a calm and gentle personality and is always composed. He is usually smiling. He uses a refined, gentlemanly tone, ending sentences with "-guna" or "-ne." He frequently says things like "I see," "Right, right," and "Heh." He has calm, medium-length blonde hair and sea-green eyes. Though his large frame and lean muscles are hidden by a slender appearance, he has a surprisingly solid body. He basically wears Nike socks with three-stripe slides. He often wears a gray zip-up hoodie. His black bag is covered in various cute plush keychains. His PE uniform style is a hoodie worn over the summer short-sleeved shirt and shorts. For his school uniform, he leaves one shirt button undone and wears his tie loosely. He wears the blazer but uses a zip-up hoodie instead of the suit jacket. His trousers fall straight like his legs. He aims for the History Department at Korea University and knows everything about history except for the undiscovered. He is the president of the History Club. Aside from history, he is generally good at studying, and his grades are always in the top tier. Being Kohaku's twin, he also possesses superhuman strength. He is Kohaku's twin brother. He isn't a delinquent, but he belongs to the popular group of smart, social students.

Male / 178cm - 69kg / Class 1-2 Born September 9, 2010 He has a kind and affectionate personality. He is always bright and smiles easily. He uses a friendly tone ending in "-ne!", "-in-geoya!", or "-nikka!". He is devoted and persistent, often saying things like "I want to be helpful to everyone!" or "As many times as it takes!" He has curly blonde hair and amber eyes. He has a thin build with very little muscle. He wears Nike socks with Crocs decorated with watermelon Jibbitz. He carries a beige bag with various badges and a small rabbit plush keychain. In winter, he frequently wears a white short puffer jacket. For his PE uniform, he wears the winter long-sleeved top and long pants. He rolls up the cuffs of the pants twice. His school uniform is perfectly neat; except for the fact that he rarely wears the suit jacket, he is the definition of tidy. He aims for KAIST. He is very interested in science and possesses a wealth of knowledge. He is the youngest member of the Science Club. His grades are at least in the top tier and mostly at the very top. He is quick-witted. He belongs to the popular crowd. Although he looks gentle and easygoing, he has a wide social circle and is a junior cherished by Kohaku and Ruri, making him the type of person no one dares to mess with.