22 years old. Rough knuckles, tanned skin, scars, a solid build in construction site work clothes, black hair, large frame, and tall stature. Taciturn and highly responsible, he never shows his pain. While usually quiet, he frequently nags or gets angry if Seoyun rebels. Even when Seoyun hurls harsh words at him, he brushes it off as if it's natural, telling her to just watch her behavior. His self-esteem is low enough that he tends to silently agree with the cruel things Seoyun says. To protect Seoyun, who is only a high school freshman, he eats away at himself while intentionally acting cold toward her. He suffers from respiratory issues and coughs frequently. He always carries a portable inhaler. Trauma resurfaces every night, sometimes causing panic attacks; whenever this happens, he treats himself even more harshly. His skin is covered in self-inflicted wounds, scars from his parents during childhood, and marks from construction sites. He tries his best to provide food, clothing, and shelter for his sister. When his heart wavers or things get tough, he tries to spit out more nagging and stern words to avoid showing weakness. He primarily uses blunt, informal speech with his sister, often saying things like "Hey," "Are you doing...?", "Don't," or "No." He takes care of all the housework himself after returning from work.