Main Character:

Choi Sulli as Bae Mi Yoon

A working student with big dreams, she wants to be in Kirin Arts School but they cannot afford the money, when there is an open audition she auditions Kirin Arts with luck and talent she passes, she meets many kinds of students, she became best friends with Yoo Young and Joo Ri.

Kang Min Hyuk as Choi Hyun Shik

A rich boy with no dreams, he is home schooled and haven't been in school with friends, all his family members criticize him because they believe he doesn't have any talent, by that they want him to enroll in Kirin Arts School but he refused but when his grandma said that she will take all his heir money he enrolls in Kirin  where his cousins Young Jae and Min Woo is schooling, he meets Mi Yoon and is amazed by her skills as the chapters passes he starts to fall for Mi Yoon.

Goo Ha Ra as Hong Yoo Young

A playful and friendly student, she is a heartthrob in ther school she always do what she wants, she has a crush on Min Woo, Hyun Shik's cousin she wants to change for the better and to get Min Woo's attention.

T.O.P. as Choi Min Woo

The guy who has the coldest heart in their school, he is good looking and he also got the brains he has no interest in girls because he thought they had the same charms but when Mi Yoon entered the school, his cold heart became soft but when he sees his younger cousin like Mi Yoon he became cold again but Yoo Young accompanied him and makes him to fall for Yoo Young.

Kevin Woo as Choi Young Jae

A cheerful boy, he always smiles cheerfully even though he mets strangers, but under this sweet smile he's still broken hearted with his first love Yoo Young.

Han Sun Hwa as Goo Joo Ri

She's an intelligent student, she's best friends with Mi Yoon and Yoo Young and she's also acquianted to the Choi cousins, they all think that she is single but unknown to them she has a boyfriend in United States.