Introducing :

Byun Baek-hyun 

A transferred student who just entered second year. Often described as feminine but he has a manly side to him. His fingers are worth melting for. He looks cold on the outside but this kid can cry when watching sad movies. 23 years of age.

Subjects taken :

•  Language
•  Vocal
•  Physical Education
• Literature
• Law

Lu Han 

A mega jerk. Supposedly, he is out of school and working but he had to retained two years in high-school. Also in his 2nd year. A player who goes around flirting and cheating. He is well recognized in the campus for his outstanding visuals and talents. 25 years of age.

Subjects taken :

• Biology
• History
• Dance
• Business
• Physical Education

Kim Jong-Dae 

The president of the vocal lessons. A sweet-looking man with sweet vocals that make girls (and guys) go crazy over him. Class joker, a playful guy. 2nd year, 23 years of age.

Subjects taken :

• Literature
• Vocal
• Languages
• Mathematics
• History​

Kim Jong-in 

President of the dance lessons. He's a quiet boy. Often teased because of his dark skin. He's cold, arrogant and will not mix with people he don't know. 2nd year, 21 years of age. 

Subjects taken :

• Law
• History
• Chemistry
• Dance
• Physical Education

Zhang Yi-xing 

Although his nick-name is the dumbest guy on earth, he is a kind soul. He looks charming and a little dumb on the outside, but he's kind and warm-hearted. Luhan's best friend since birth. 2nd year, 24 years of age. He comes from a rich family.

Subjects taken :

• Dance
• Vocals (only because his parents want him to be a successful idol and is willing to pay more for another main subject)
• Languages
• Chemistry
• Biology

Other characters who aren't introduced : 

1. Kim Junmyeon
2. Do Kyungsoo
3. Park Chanyeol
4. Oh Sehun
5. Huang Zitao
6. Kim Minseok