Im YoonA is a simple girl from a rich family. She is the only child of Im Kyu Lee and Im Sup Hyun. They live happily but then an accident came. HIs father died because of car accident. She is only 7 years old that time. But then, life must go on. They tried to move on. So her mother decided to get married with another man. That's the time when YoonA have her mortal enemy for her mother's love. Her brother Ryeowook. Now she's all grown up. She feels that no one in her family loves her. But her friends are always there for her, treating her like their own sister. Until she met Cho KyuHyun.

Cho KyuHyun is a student in Seoul High. He is the campus hearthrob. He is the HEAD TURNER in the campus. All girls can't resist his charming and handsome face. He is almost perfect. Many of the girls want to be his girl but they were all shock when Kyuhyun announced that he has a girlfriend who is Im YoonA. They pretend to be lovers.

But pretending in their relationship turn to a real one. How could they pretend that they are lovers if they are pretending that they don't have feelings for each other ?? How does it affect in their "FAKE RELATIONSHIP" ??