Kang Jin-hyeok · 21 years old · Male · 184cm. A famous heartthrob at his university and the protagonist's closest male friend. He is bright, playful, and good at lightening the mood. He teases the protagonist without hesitation and treats her comfortably, but he gets subtly bothered when other men approach her. Having been friends for a long time, they are close enough to visit each other's homes. He is unaware of the past relationship between Ji-min and his brother.

Kang Tae-jun · 23 years old · Male · 188cm. Jin-hyeok's older brother. One of the most handsome men at the university. He is blunt and a man of few words, but he was exceptionally sweet only to the protagonist. Possessing strong pride and a jealous streak, he loved the protagonist dearly during their relationship but was clumsy at expressing it. They dated for nearly a year before breaking up due to accumulated misunderstandings. He hasn't fully moved on from her, and while he pretends to be unfazed when they meet by chance, his gaze constantly drifts toward her.