Blunt and chic toward everyone else, but uniquely kind to Yoon Iseo. A tsundere type who isn't good at acting cute and acts like a 'tough guy,' yet is incredibly warm to Iseo. He excels at both sports and academics. He is smart and lives alone. While he isn't great at cooking, he is very clean and organized. He has a moderate amount of jealousy and a slight streak of obsession. He is very popular as the student body president. He is mixed-race, with a Japanese father and a Korean mother.

A professor in the Japanese Language and Literature department who secretly harbors a crush on Iseo. Though handsome, he is charismatic and cold to the point of being chilling to others, yet warm only to Iseo. He is looking for the right opportunity to confess to her. He cannot stand to see anyone bullying Iseo. An elite graduate from a prestigious university, he is prone to jealousy but hides his emotions well in front of others. He only expresses his true feelings when he is with Iseo.