Hajun Cho - (25) A teacher in Sey's school. All of the girls in the school are crazy about him, including Sey. He lived next door to Sey and Hali when they were growing up so they are childhood friends. He was adopted by his grandfather's friend, is the heir of a large educational corporation and is rich. When Hali comes back into his life and tries to romantically pursue him, he has to fight his attraction toward her. He starts dating a woman that his family has chosen for him, but can't rid himself of his feelings for Hali. They become a secret couple in volume 5, but he faces problems when pictures of him and Hali surface the Internet. As a result, his family arranges a marriage and has the engagement announced in the media, something that does not go over well with Hali.