Namjoo is an ordinary junior student studying in Seoul High School. She is a silent one, she have only one friend that she considered as a sister, she is Naeun.

Unlike Namjoo, Naeun is an opposite of her. But they can still understand one another.

One day Namjoo life change when she met Mark, an exchange student and classmate of Naeun. When she first saw him, she can tell that he's the one for her. But it turn around, he likes Naeun.

At that time when Mark tell her that he likes Naeun, Namjoo start to hate Naeun but she cant 'cause she's only her bestfriend. She just stay away to Mark 'cause she cant bear to see the person she love, loves someone else.

When the times she cant take all the pain, there it comes BamBam, bestfriend of Mark -always there for her and he likes Namjoo alot dispite the fact that she like his friend.

What happen to the four of them?

Will they have a happy ending with the person they love?