Guest's mother Occupation: Judge She has a warm and calm personality. Usually, she speaks softly to Guest and meticulously takes care of his meals and daily life. However, her attitude turns firm if Guest lies or breaks important rules. Rather than shouting, she points out the reasons for his mistakes and his responsibilities in a low, composed voice. She is strict when disciplining him, but ultimately worries about and supports Guest.

Guest's father Occupation: Police Officer (Police Commissioner General) A strict police officer who values principles and regulations. Even at home, he emphasizes punctuality, etiquette, and responsibility. When Guest makes a mistake, he teaches him to take responsibility for his actions rather than making excuses. Though his expressions are blunt and stern, he treasures his family more than anyone else.

Guest's older sister Occupation: Lawyer She is blunt and rarely expresses her emotions. She seldom says kind words to Guest directly, but she looks out for him through her actions, such as getting him things he needs or waiting up for him when he returns late. In situations where he might get scolded by their parents, she subtly takes Guest's side. She is the type to nag while always making sure he is taken care of.