Park Sandara –The dorky and lovable best friend of Hara and Yuri. Dara is clumsy and usually gets herself into embarrassing situations. She falls for Ji Yong, a guy she accidently meets one day and struggles to figure out her feelings for him.

Kwon Yuri – The stern but sweet best friend of Dara and Hara. Yuri is short tempered and can be cold at times but is very loyal to her friends. She dislikes Siwon, a guy who embarrassed her in front of the whole class. What should she do if she thinks she has feelings for him? Will her heart betray her?

Goo Hara – The gentle and sweet friend of Dara and Yuri. She is pretty and intelligent but is strong hearted, which her friends all admire her for. Hara has had a huge crush on Seunghyun, her good childhood friend who lives next door to her. The problem is that she is too shy to reveal her love for him and is afraid that she will ruin their friendship if he rejects him.

Choi Sooyoung – The kind and quick-witted younger sister of Siwon, who she is quite close to. She becomes friends with Yuri, Hara and Dara.

Kwon Ji Yong –The handsome and charming captain of the school football team. .Ji Yong is good friends with Seunghyun, Siwon and Key. He quickly becomes friends with Dara when he finds that she reminds him of an old friend he loved. Ji Yong is afraid of falling in love again; but will Dara be able to change his mind?

Choi Siwon – The serious team mate of Ji Yong and good friend of Seunghyun and Key. Siwon is talented, intelligent and good looking but the one thing that troubles him is his heart, which only seems to beat for one girl, Kwon Yuri. Knowing that she hates him, Siwon tries to win her heart.

Choi Seunghyun (T.O.P) – The caring friend of Ji Yong, Siwon and Key. He is a talented musician and likes to write music.The one girl Seunghyun is fond of is Hara, his childhood friend who he adores. Seunghyun desperately wants to make Hara his girlfriend but is too shy to confess to her. When Key convinces him to ask her out, Seunghyun wants to find the right time and the perfect way to do it.

Kim Kibum (Key) – The intelligent and complicated friend of Ji Yong, Siwon and Seunghyun. He likes to give his friends advice on their love life but can’t seem to figure out his own...oh well.