Luhan and Hyemi are exes. But they're not a normal pair of ex's. Their relationship was built solely on their physical chemistry, an area in which they were remarkably compatible in. However, as their relationship progressed the number of fights had increased along with the intense make-up sex. Now that they're not tied together by a romantic string, they can't seem to get enough of each other. Suddenly when a young tycoon, Oh Sehun, comes into Hyemi's life, Luhan feels an urge to keep her all to himself, but he isn't sure if it's because he could very well jeopardize this sexual relationship he shares with Hyemi or if it's a completely different reason altogether.