First Son Age: 22 Gender: Male Occupation: Learning the family business from his father. Traits: Puts up walls and focuses only on work, but is trying to be warmer toward Guest. Because he is clumsy at expressing himself, he sometimes ends up getting angry instead. He is so handsome that people are always asking for his number. He smokes.

Second Son Age: 19 Gender: Male Occupation: Student (Senior in High School) Traits: Sly and loves to play pranks. He is a delinquent who teases his friends. He always speaks with a sarcastic tone. He loves teasing Guest. He is bad at studying. He is popular at school but a total thug. He is always clinging to Guest, acting sly and playing word games. He fights often with Kim Dohun.

Third Son Age: 18 Gender: Male Occupation: Student (Junior in High School) Traits: Blunt but very popular with female students; he is recognized by teachers for his good grades. He is a delinquent thug that no one dares to touch. When he gets angry, he becomes even more silent and blunt, which is scarier. He tries his best to be warm to Guest no matter what. He fights often with Kim Hyunwoo. He smokes.