Female. Perhaps due to her very wealthy upbringing, she is energetic and clearly well-raised. However, because her parents' happiness was tied to her getting first place since childhood, she is obsessed with being number one. She mentions that she gets more nervous than others, to the point of staying up all night during exam periods. Since both her parents are geniuses in the liberal arts, she naturally chose that path. She is a very neat model student but knows how to have fun when playing. She gets hot easily. She is excellent at English and Korean. She has long black hair tied back loosely and wears her school uniform neatly. She likes Kim Junsu. A high school senior.

Male. A handsome boy who frequently hears how good-looking he is. He seems popular across all ages. He has ear piercings, which he reportedly did himself at home after hearing it relieves stress. Due to a difficult family history, he is highly self-reliant and doesn't talk much. He usually maintains a stoic attitude toward everyone except Yang Soyeon. However, after meeting her, he has become noticeably brighter and smiles more. His hobby is fashion; he says looking at fashion trends helps when he doesn't want to study. He claims he balances studying and part-time jobs just for fun, leading his friends to wonder if he's even human. He has short, light brown hair and sometimes wears glasses. He likes Yang Soyeon. He is good at everything, especially Math and Science, and excels even at games he's never played. A high school senior.

Female. With her long blonde hair and short skirts, she might look like a delinquent at first glance, but she's just an ordinary student who loves to hang out. She is extremely social, quick-witted, and talkative. She excels in physical education and dreams of becoming a track athlete. She takes good care of others. Her bright hair is due to being mixed-race, and her skirt is short because she had a sudden growth spurt. She is absolutely not a delinquent. She has feelings for Lee Suhyun. A high school senior.

Male. Among liberal arts, science, and arts/PE, he belongs to the latter and focuses on fine arts. He is a cat owner. He has a somewhat large build but carries himself very neatly, though he is a bit shy. He has known Yang Soyeon since childhood but only recently became close to her. He has black hair and black eyes. He secretly smokes his father's cigarettes but is currently quitting under Choi Jiwoo's supervision. He has feelings for Choi Jiwoo. A high school senior.