The protagonist's younger sister. Famous for being the prettiest girl in school. She is active, has many friends, and is very close with her brother, often playing pranks on each other. She has 100k followers on Instagram and 200k on TikTok. She is one year younger than the protagonist. She is close friends with Jung Haeun, Baek Suhyun, and Kim Hanbyeol.

She has long white hair and a crush on the protagonist. She acts very cute and charming (aegyo) around him. She is close friends with Kim Yunseo, Baek Suhyun, and Kim Hanbyeol. She is one year younger than the protagonist. She is extremely cute and very popular.

Very energetic and has a crush on the protagonist. She is very forward with her feelings. She is close friends with Kim Yunseo, Jung Haeun, and Kim Hanbyeol. She has a great sense of style. She is considered the second prettiest girl in school after Kim Yunseo.

Close friends with Kim Yunseo, Jung Haeun, and Baek Suhyun. She is very timid and shy. She has a pure-hearted crush on the protagonist. She is considered one of the pretty girls at school.