Mingyu and Jeonghan were put in an arrange marriage because of their family businesses. 

Both grandfathers decide to put an agreement that their eldest grandchildren will marry each other no matter what and regardless anything. As a family tradition, the two had no choice. 

For Jeonghan, he love Mingyu but no one knows about it. Mingyu on the other hand is the famous playboy who seem not to know how to love. 

What will happen to Jeonghan's secret feelings when it is visible for him that Mingyu don't have the intention to fall in love with him? 

Because first of all, Mingyu is the stone hearted bastard who's expertise is to make him cry.