Being born with a silver spoon in your mouth may not be as good a situation as the rest of the student population of Seoul High thinks. When Key's grandmother comes hounding after him for her future grand daughter-in-law, he ends up resorting to desperate measures - getting a fake girlfriend. After excluding the girls who are part of his crazy fan club, only a few candidates are left, namely the school nerds, tomboys and the new transfer student. Since the transfer student is his only likely choice, he convinces her, or more specifically, blackmails her into pretending to be his girlfriend. There are no rules in this little game of pretense except one, don't fall in love with the other. But rules are made to be broken now aren't they?