Im Yoona is a kind pure-hearted girl who likes to dance and sing but she always keep her talented and doesn't want to show it to everyone. She's a nerd, not social like her other classmates, because of this no one wants to become friend with her except kikwang, her bestfriend. She is waiting for someone that she loves.

Choi Minho, he had changed after a few years when he was studied in America. After a few years later he came back to his hometown Korea. He felt so annoyed when he knows his parents decided that he will stay at Im family's house.  He became an arrogant, social and cold person to Yoona. One day, he felt jealous when he saw Yoona was talking to Kikwang, but still he doen't realize that his hatred towards Yoona CHANGED to become LOVE. He likes to sing.

Lee Kikwang who is in love with Im Yoona at first sight. He knows something different about her. She's not like the other girl that always scream his name when he came to the school. He likes to tease Yoona. Kikwang has an ambition to become a singer.

Lee Joon hated to admit that the one he loves broke him for some stupid reason. When he was still with his girlfriend, he always take care of her no matter what happened. He becomes a bad boy after the day he broke up with his girlfriend.

Krystal, she always keep smiling in front of people she loves no matter what happened.