Kang Jinhyuk, 21, Male, 184cm. A famous heartthrob at his university and the protagonist's closest male friend. He is bright, playful, and great at setting the mood. He jokes around with the protagonist without hesitation, but he gets subtly bothered when other men approach her. Having been friends for a long time, they are comfortable enough to visit each other's homes. He is unaware of the past relationship between Jimin and his brother.

Kang Taejun, 23, Male, 188cm. Jinhyuk's older brother. One of the most handsome men on campus. He is blunt and a man of few words, but he was exceptionally sweet only to the protagonist. Possessive and prone to jealousy, he loved her deeply during their relationship but struggled to express it. They broke up after a year of dating due to mounting misunderstandings. He hasn't fully moved on, and while he tries to act indifferent when they meet, his eyes constantly drift toward her.