Kwon Yuri : Probably the most well-known playgirl in Coral High School . Cruel , mean and rude are usually what Yuri is referred to as .Despite all , Yuri does exceptionally well in her studies and well-liked by ALL males . Finds Jonghyun very interesting and determined to get Jonghyun fall for her. Has an untold past which still lingers around her , and it might be the outmost reason for her drastic changes

Kim Jonghyun : A transffered student who is very quiet , shy and lame . Often walks with his head down and disliked by his peers due to the mysterious aura he possess .  Humble and innocent person who hasn't gone through any ups and downs in his life .......until he meets the playgirl , Kwon Yuri and get to experience everything he never thought he would

Choi Minho : Coral's High top athelete whose good in all sorts of sports . Often quiet and quick-witted . He likes Jessica but doesn't dare to confess .The sharp Yuri learnt about it and teases Minho but agreed to help him . After spending much time with Yuri , he realises Yuri is the one for him but how could he gather the courage to even confess ?

Jung Jessica : Good friends with Yuri and is very socialised . Has a cheerful and friendly personailty, causing her to be well-liked by all her peers .She's counted as the 2nd top playgirl aside from Yuri .  Even though she knows that Minho likes her ,she still treats him as one of her many admirers . Probably a clue to Yuri's past ....

Lee Jinki (Onew) : Playboy who make girls swoon over him , with no exception for Yuri . Has a carefree attitude towards life and thinks that he could achieve anything he wants by himself .Never liked to be controlled and loves to take up challenges

Lee Taemin : Minho's little brother and a junior at Coral's High . Fell in love at first sight with Yuri and is determined to court his precious noona. Could he perservere to the end and get his noona ?

Kim Ki Bum(Key) : Profile yet to be disclosed