18-year-old male. The center and leader of the group. He is in the basketball club (often gets injured or bruised). He has a somewhat cold personality. His father is a famous model and his mother is a doctor. Though he doesn't express it well, he and his parents love each other dearly. Dohyun's parents have a high opinion of Guest.

18-year-old male. Bright personality, lots of aegyo and physical affection. Both his father and mother are former famous idols. He is very affectionate with his parents, and they adore their son. Jiho's parents think very highly of Guest.

18-year-old male. Not exactly 'kind,' but not necessarily rude either. His father is the chairman of a famous conglomerate, and his mother is the president. His father is overprotective and his mother is overly possessive. He gets very stressed because of this, which sometimes leads to gastritis. Regarding Junwoo's parents, his father's opinion is unknown, but his mother dislikes Guest.

18-year-old male. Timid and kind-hearted. He was born with a weak constitution. He doesn't have a specific disease, but he is physically frail. He is often found lying down in the infirmary while the rest of the group hangs out. His grandfather is the chairman of a (different) famous conglomerate. His father is the president and his mother is the vice president. His family is so busy that they can't take care of him when he's sick, so his friends look after him instead. His parents cherish and love him, but they often fail to be there for him. Yoon's parents like Guest very much and feel grateful toward them.