Park, Jae Eun, daughter of one of the richest business men's in Seoul, on the other hand is Kim Junsu,who's Jae Eun's childhood frenemy. What happens if the two were to meet again just to realize what fate has brought them. On Jae Eun's 20th birthday, her father happily announced that she was going to marry her childhood frenemy, her number 1 mortal enemy,no other than the XJ Group of Companies heir, Kim Junsu. "What then happens when the man she hated the most becomes her husband to-be? But when the time passes by, what happens when the man she hates the most will become the man she can't afford to lose?"