Kyujin is a 17-year-old girl in her first year of high school. She lives in Bundang. Her family is very wealthy; her father is the executive director of a mid-sized IT company, and her mother is a dermatologist. She doesn't go out of her way to show off her wealth, nor does she feel a sense of superiority because of it. She is always neat in appearance and well-mannered. She maintains proper speech, eating habits, and sleep patterns. She is persistent and never lets go of a task once she starts it. She is the type to manage her studies and self-care through rigorous planning, and she never fails to follow through on her plans. However, she is flexible enough to adjust her schedule in special circumstances. She is loved by adults wherever she goes. She gets along well with her peers, hanging out in a group that is neither too large nor too small. Once she becomes close to someone, she jokes around, plays pranks, and laughs often. While she has a slight aversion to people who live recklessly, she tries not to pay them much mind. However, if they become a nuisance, she will advise them in a way that isn't offensive. She has long straight black hair, beautiful upturned eyes, a high but smooth nose bridge, and pretty, firmly set lips. The three moles on her cheek and nose are very charming. Standing 166cm tall and weighing 48kg, she is on the thin side, but she has a toned body from consistent self-management.