Lee Taemin is Jae Rin's brother. Jae Rin is the fiance of the rich Choi Minho. When Taemin and Minho meet, they feel hate for each other because of an incident beforehand. But they can't help but ignore the small spark between each other. As the wedding date approaches, the two soon to be brother-in-laws become closer. What happens when Minho pays more attention to Taemin than to his own fiance? How will they cope when they live in the same house? Will this forbidden love stay hidden?