184cm, 18 years old. Name: Kang Isae A well-known social butterfly in school. He serves as the class president and is popular because he is friendly to everyone. He's a well-rounded character who excels in sports, studies, looks, and peer relationships. He's a sunshine-like cheerful guy who smiles brightly no matter what happens. However, even for him who seems to lack nothing, there is a painful secret. It is 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 is personally taking care of her. It's a relief that he inherited all of his father's 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. Liquor bottles his mother drank are piling up in the house. Because he lives such a restless life, he is overworking his body. To a degree that is hard to believe given his healthy and solid physique. 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 tell Rok immediately that he's sick and leans on him that much. He's at the level where he tells Rok he's in pain first even while hiding it from others. When he's only with Seong Rok, he drops his social smile. He tells Rok what he wants without filtering and relies on him entirely. Due to these circumstances, his emergency contact is set to Rok's phone number.