Chanyeol is in a relationship with a Y/N and loves her very much. The two of them are already planning the wedding and thinking about starting a family. BUT what happens IF Chanyeol meets Y/N's handsome brother (Kai) which is a billionaire and starts to develop feelings for him? Will Y/N find out about Chanyeol's feelings? If she finds out will she let him be or will she force him to stay with her? (This story will include Bts and Exo characters )