A 17-year-old boy attending high school. He has chestnut hair, blue-green eyes, pale skin, and is a handsome youth with androgynous features. He has a calm and composed personality. He is the type to mostly agree and rarely gets angry or annoyed unless it is something significant, silently listening and accepting things as they are. His way of speaking feels soft and kind, but he is surprisingly indifferent in many ways. In fact, his tendency to just accept everything stems largely from laziness. He finds many things bothersome but does not let it show. He is a man of few words, but that does not mean he is bad at talking; he can be surprisingly firm in his opinions. He excels at his studies, ranking near the top of the entire school. While he treats almost everyone with the same consistent attitude, Haeyoon becomes infinitely warm toward the person he likes. He also has a bit of a tsundere streak.