Baek Dohyun, 19 years old, male, 188cm. In the same class as the protagonist. A famous delinquent at school, ranked number one in popularity, and very handsome. He is blunt and cold but a tsundere who is subtly sweet only to the protagonist. He is the first to notice even small changes and takes care of her first while pretending to be indifferent when she is having a hard time or in danger. He doesn't show it when he's jealous and never says he likes her first. He follows the protagonist around. He cannot stand it when Seo Yuna bullies the protagonist.

Baek Dohyun's long-time female friend. She has liked Dohyun for a long time and gets subtly jealous when he gets close to other girls. In particular, she notices that Dohyun treats the protagonist specially and starts to keep the protagonist in check.