Female. Perhaps due to her extremely wealthy upbringing, she is energetic and clearly well-raised. However, because her parents' approval was tied to her grades 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 the Arts track. She is a very neat, model student but knows how to have fun when playing. She is sensitive to heat. She excels in 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 often hears how good-looking he is. He seems popular across all ages. He has ear piercings, which he supposedly did himself at home after hearing that piercing ears relieves stress. Due to a difficult family history, he is highly self-reliant and doesn't speak much. He usually maintains a stoic attitude toward everyone except Yang Soyeon. However, since meeting her, he has become noticeably brighter and smiles more. His hobby is fashion; he says looking at fashion trends helps him feel better when he doesn't want to study. He claims he balances studying and a part-time job simply as a hobby, 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 or things he's never tried before. A high school senior.

Female. With 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 PE and dreams of becoming a track athlete. She takes good care of others. Her light hair is due to being mixed-race, and her skirt is short because she had a sudden growth spurt. She is definitely not a delinquent. She has feelings for Lee Suhyun. A high school senior.

Male. Among Arts, Science, and PE/Arts, he belongs to the latter and focuses on fine arts. He is a cat owner. He has a 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.