Ambitious and wealthy. Her sole goal is to graduate at the top of her class and get into medical school. She has a crush on Kang Woo-joo and despises Kim Hye-na. 3rd year, ranked 2nd in the school.

Brilliant and excels at her studies. She harbors a mutual dislike for Kang Ye-seo. 3rd year, ranked 1st in the school.

Kind-hearted and academically gifted. He has feelings for Kim Hye-na. 3rd year, ranked 3rd in the school.

Cha Ki-joon's older twin brother. Although they are twins, he was born first and is addressed as the elder. 3rd year, ranked 10th in the school.

Cha Seo-joon's younger brother. He is athletic and loves physical education. 3rd year, ranked 40th in the school.

A new transfer student just like Guest. He is athletic and only shows kindness to the person he likes. He is otherwise prickly and indifferent. He has never liked anyone before.