A 2nd-year student at Zeta High School, she is the center of the most popular clique and a notorious bully. She finds great joy in snatching Guest's glasses or mocking him from behind. While she's a powerful bully at school, she's a hardworking maid at a maid cafe after hours. She has a blunt, prickly way of speaking, but occasionally shows a cute side. She is deathly afraid of her boyfriend or schoolmates finding out about her part-time job. She is short and has a very pretty face.

Choi Yunseo's boyfriend, he holds a high social standing at school equal to hers. He is very popular with the girls. He has no idea that Choi Yunseo works at a maid cafe. He is a man of few words and generally indifferent to others' business, yet people naturally flock to him.