Suk Jin

-The oldest, knows Jae Suk really well.
-Used to study music but decided to learn hosting skills
- Wang Ko

Jae Suk

-Suk Jin's friend since childhood and the second oldest.
- Same course with Suk Jin

Jong Kook

-A tough commander and Jae Suk's rival at school
- Study art music
- Kookie

Gary

-Haha's best friend, he has a slight crush on Ji Hyo
- Take music course

Haha

-Gary's awesome friend who always look up on Jong Kook who is also his best friend.
-In the same course as Gary and Jong Kook
- Haroro

Ji Hyo

-She acts more like a guy that a gal. 
- Take performing art
- Mong Ji / Miss Mong (called by Jae Suk)

Kwang Soo

-Youngest and tallest among all. He respects everyone around him.
-In the same class as Ji Hyo (core and additional)
-Gilin