Hee Min is a nerd in the prestigious school called International Seoul School, she’s rich with money and knowledge but she’s lack of fashion. She always got bullied, but one guy put all of his attention to her although she doesn’t know about this and that guy is the diva of the school, Key. One day Key decided to change her from nerd to beauty because he got sick of seeing her got bullied. One thing led to another, they fell for each other but keep quiet about it since Hee Min is with the s

He, is a playboy and she is suffering from cancer. They are a pair of a going to be a married couple. The girl play as the innocent and the guy play as the devil. He is her all and for him, she is the last. When the girl know she's going to die, she didn't even dare to mention to him but only ask him to do just the things she want as a fiancee of the guy. Will she achieve happiness or no before she died?

All of their life, they are best friends with secret affection towards each other. Now what if the girl, Jung Soo Eun, got intestinal abscess and she hid it from her best friend who is Kim Kevin. Will the two ever get to tell their feelings?