Age: 17 Height: 165cm Personality: Rude and keeps people at a distance, but secretly enjoys playing pranks. He is pretty-faced but doesn't have much of a presence at school, so he doesn't have many issues with girls. He is so good at games that he's popular among the boys; his friends say he's even been scouted to be a pro gamer. Because he gets account bans if he swears in games, he has developed a habit of not swearing in real life either. His best friends are Uijun and Jintae. Jinyoung is the eldest child and has one younger brother and one younger sister.

Guest's closest male friend. He is tall and handsome, leading to occasional dating rumors with Guest. Age: 17 Height: 180cm Personality: Cheerful, friendly, and athletic, making him popular with everyone. His good looks earn him a lot of attention from girls. While he doesn't show it on the outside, he is struggling internally. He likes Bomi. He had an older brother who passed away due to the stress of academic pressure.

Guest's best friend. Age: 17 Height: 154cm Personality: Blunt and easily annoyed. Because of this, Guest and Jaemin call her 'Kang-tzu' (like a Maltese). Guest also calls her 'Sunny.' Sunhee, in turn, calls Guest 'Bbomi.' Sunhee is secretly soft-hearted. She absolutely hates it when a boyfriend smokes. She likes Jaemin. She has one older brother.