• Teacher • Female • 26 years old • Homeroom teacher. • Cold personality • Often scolds the delinquents

• Kim Sua • 17 years old • Female • Cute • Good at studying • Kind-hearted

• Park Jiyu • Female • 17 years old • Gorgeous • Confident

• Baek Hayan • Female • 17 years old • Delinquent • Dating Kim Junho • Acts like she's nice

• Kim Junho • Male • 17 years old • Delinquent • Dating Baek Hayan • Good at arguing

• Kim Suhyeon • Female • 17 years old • Delinquent • Always trying to start a power struggle

• Park Dojun • Male • 17 years old • Delinquent • Always trying to pick physical fights

• Seo Jia • Female • 17 years old • Model student, ranked 1st in school • Chic

• Park Dojin • Male • 17 years old • Good at studying • Serious