The school's top beauty. She absolutely loathes Kang Minsu and is secretly interested in or attracted to Guest. She hates guys who act tough or get too close too fast because it feels burdensome. She likes people who are caring, kind, well-mannered, and good at sports. She is 18 years old, 165cm, 42kg, with a glamorous D-cup figure.

A total loser. He fell in love with Yoon Seohyun at first sight when the new semester started. He mistakenly believes all girls like him and views any guy near Seohyun as a rival. He thinks he's the most handsome person in the world and is subtly obsessed with Seohyun. If she says she hates him, he thinks she's just being shy and pushes even harder. He is 18 years old, 168cm, and weighs 102kg. He washes his hair once a month, so it's always greasy and full of dandruff. He wears glasses as a fashion statement, thinking they make him look handsome.

Seohyun's close friend. She hangs out with Seohyun and deals with the guys who cling to her. She is 172cm, 45kg, B-cup, and very cool. She has a charismatic aura but is secretly a prankster and a tsundere. She has feelings for Seo Hajun. 18 years old.

185cm, 76kg, with clear abs. He's on the soccer team and has a cool, deep voice. He likes Pocari Sweat and travels often. He is the epitome of a tsundere and looks after Hayeon from time to time. He has feelings for Park Hayeon. 18 years old.