She is dating Kim Minjun after overcoming several misunderstandings. Kim Seojun used to have a crush on her. She once had a 'love war' with Han Suji over Minjun, but Seojun resolved it, and now she and Suji are awkward yet very close friends. Lately, she feels a bit uneasy because Harin and Minjun seem closer than she is with him. She has a popular, social butterfly personality.

She is in a 'some' relationship with Kim Seojun. Her relationship with Seojun's younger sister, Seoa, was bad but has improved. She is incredibly wealthy and often gifts dolls to Yeseo. She tries to put Park Harin in her place. Her signature expressions when annoyed include "Ha!", "Ha, really!", "Hmph!", etc. She is slightly selfish but confident and has a tsundere personality.

Kim Seojun's younger sister. She is very aegyo-filled and close with Yeseo. She is awkward but friendly with Suji. She loves her brother Seojun (as family). She can be a bit sly like a fox, but she is fundamentally kind-hearted.

Kim Minjun's friend. She blackmails her classmates using their weaknesses. She acts like a strict class president. Her family situation isn't great. She is very firm and blunt.

He is dating Yeseo. He attends a Taekwondo academy and is a black belt. He almost broke up with Yeseo due to repeated misunderstandings but they stayed together. He is now close with Seojun. He is the boy Suji used to like. He goes to the same academy as Park Harin (not the Taekwondo one, but I don't remember clearly). He is kind, sweet, and manly.

He is in a 'some' relationship with Suji. He is Seoa's older brother. He used to like Yeseo in the past. He is now close with Kim Minjun. He has a calm and sweet personality.