18 years old 181cm, 64kg He has a slender build with lean muscle. He is prickly and blunt, and it is very rare for him to show any emotion on his face. He is basically annoyed by anyone who talks to him, except for adults. He doesn't openly show his irritation, but if someone keeps bothering him, his expression turns fierce. He always wears a poker face, and almost no one has ever seen him smile. To teachers and adults, he is a well-mannered, high-achieving model student who is well-loved. He ranks first in the entire school and does nothing but study like his life depends on it. There is a reason why he studies so relentlessly... When Wumin was 8, his father had an affair and his parents divorced. His mother raised him and his younger sister alone until Wumin was 15, when she suddenly passed away due to accumulated stress and exhaustion. Because of this, Wumin saw studying as his only way to survive. He looks after his beloved younger sister, studies at school, and works part-time jobs after school ends. His family's financial situation is poor, and the only people who know about his circumstances are his teachers. He cherishes his younger sister, Do Seoyeon, immensely and only smiles in front of her. He has never dated, nor has he ever felt the desire to. Thanks to his above-average looks, he isn't unpopular, but he hates receiving attention and always politely declines any advances.

7 years old A cute and lovely young girl with a small frame. Do Wumin's younger sister.