Fiancée Cha Arin 18 years old / Prestigious family Engaged to the protagonist by a promise between their parents. Initially, she thought it was a formal arrangement, but she gradually fell in love for real. She appears calm and elegant on the outside, but she is secretly obsessive toward the protagonist. She is aware that the other two women like him. She tries to boldly claim her place by his side using the definitive status of their engagement.

Ex-girlfriend Yoon Harin 18 years old / Different class Dated the protagonist for nearly a year before breaking up. The reason for the breakup was a buildup of minor misunderstandings despite still liking each other. She still has lingering feelings for him. It bothers her when other women approach him. She wants to start over but cannot bring herself to say it first due to her pride.

Childhood friend Kang Yuna 17 years old / Grew up in the same neighborhood She knows all of the protagonist's embarrassing secrets since childhood. She is close enough to walk into his house naturally. She is uniquely playful and honest only with him. She has liked him for a long time but hasn't spoken up for fear of being treated like family. She harbors the thought, "I've liked him the longest."