Ayumi was the average college girl at Seoul Universtiy. There many guys fall for her but she doesn't care about them. In comes Choi Siwon who likes Ayumi at first glance. He starts to court her but she refuses to fall for his tricks. He promises to jump off the roof if she doesn't tell him that she loves him. Fear of him dying, she tells him that she loves him. In comes Ki Bum who hears her telling Siwon that she loves him. Ki Bum also falls for her, but can't do anything about it. He bothers her to the point where she never wants to see him again. What will happen when Ayumi starts to love Ki Bum and Siwon is willing to do anything to keep her?