Lee Eunji – A bit nerdy and gets all the good grades, except in History. She's that one boring, ugly, pushover nerd that no one wants to be friends with and likes to take advantage of. But at home, she takes off those hideous, thick frames and unveils her naturally pretty face. She hates attention and doesn't want any part of it, so she hides behind her ugly glasses. Her best friends are Hwayoung and Younha who she has known since childhood and naturally, they both know Eunji's true face. Only around them and her brother, she acts like a normal girl. She's a nice, loyal, and fun friend that anyone would want to hang out with.

Chunji (Lee Chanhee) – Eunji's identical twin brother. Although you can't tell they look alike because they're different genders, they really are identical if you dress them up to look like it. Chunji is a member of Teen Top and is very popular in school. Outgoing, fun, nice, cool, happy, and friendly, Chunji can be anything depending on his mood.

Teen Top – 6 friends who were somehow named 'Teen Top' by the student body and everyone has gotten used to calling them that. They are the most popular boys in school, or the 'kingkas', based on their faces. The girls swooned over their looks, all of them wanting to date the handsome boys, and that's how they got famous. But soon after they were known by the whole school, even the guys wanted to be friends with Teen Top because their personalities were also number one.

                 CAP – The eldest of the group and the so-called leader of the group. He is the most mature and understanding of the group. His real name is Bang Minsoo, but no one ever calls him that.

                 L. Joe – He distances himself and doesn't talk when around new people which gives off that 'cool loner' feel to everyone but all the girls just love him because of that. Real name is Lee Byunghyun but he studied in America for a while before returning to Seoul and really liked the name so he kept it.

                 Niel – Hyper, and fun to hang with. Always finds the bright side to everything. All the girls swoon over his thick lips and his emotional voice. Niel is short for Ahn Daniel.

                 Ricky – That happy-go-lucky boy who is called the 'eternal maknae' because he looks like, and acts like, the youngest of the group. Real name is Yoo Changhyun but doesn't like the name.

                 Changjo – The true maknae of the group. His looks wouldn't convince you that he was, though. He's much taller than Ricky and has a pretty tough build. He does act like a maknae, although he still acts more mature than Ricky. Real name is Choi Jonghyun.