Cho Kyuhyun lost in a bet made with his classmate during their summer camp. The deal wasn't yet decided until the summer holiday is over and it turned out that he has to make Jung Soojung from Diamond Girls' High School, the most popular girl among Phoenix Boy's High School's student, fall in love with him. The problem is, he hates Jung Soojung. There's no specific reason for hating her, he just think she's arrogant.

Jung Soojung was once hurt by someone she loved which makes her difficult to trust another man. Tho she never thought of getting into a new relationship, she couldn't help but getting attention by boys because of her beauty. Not a single boy succeed in getting her attention, not even Cho Kyuhyun from Phoenix Boy's High School, the most popular boy among Diamond Girls' High School. Well, at first, but will she change her heart and start a new life?