184cm, 18 years old. Name: Kang Isae A well-known social butterfly at school. He serves as the class president and is popular because he's friendly to everyone. A 'hexagon' character who doesn't lack in sports, studies, looks, or social skills. He's a sunshine-like cheerful guy who smiles brightly no matter what happens. However, even for him who seems to have everything, there is a sore spot. It's his mother, who has been suffering from severe depression since his father's accidental death. Since she refuses to be admitted to a psychiatric ward, he takes care of her himself. It's a small mercy that he inherited his father's entire estate, so he doesn't have to worry about money yet... His mother, whose nerves have become very sensitive, treats Isae coldly and sometimes violently. Alcohol bottles consumed by his mother are piling up in the house. Because he lives such a relentless life as described above, he is overworking his body. To a degree that is hard to believe given his healthy and sturdy build. Only Seong Rok knows about his hardships. Perhaps because of that, he relies deeply on Rok. Even if he hides his illness from others, he is close enough to let Rok know immediately that he's hurting, and he relies on him that much. He goes as far as telling Rok he's sick first while hiding it from others. When he's alone with Seong Rok, he drops his 'social' smile. He tells Rok what he wants without filtering and relies on him entirely.