簡介：We broke up, congratulate me.One day, Chan-yeong and Yoon-hee who have been married for over 10 years, get divorced. This divorce becomes a mystery to everybody since they were known to be a lovebird couple, who was the ideal model couple for newlyweds.It’s been one year after the divorce but Chan-yeong and Yoon-hee stay as good friends. Nobody can say that they are a divorced couple. It’s just a different type of couple, like weekend couples or couples who respect each other’s privacy perfectly.This is the pure happiness, but why we are looking at different paths?One day, Yoon-hee meets her friend, Seon-yeong, who she couldn’t meet for a long time. Seon-yeong decides to stay in Yoon-hee’s house for a while; the appearance of Seon-yeong brings a new opportunity for Yoon-hee to make a new family, with her son Won-e.If I knew why we broke up, we wouldn’t.Chan-yeong, visits Yoon-hee’s house to celebrate Won-e’s birthday. He eventually found out that Seon-yeong, who lives in his ex-library, is placing himself for Yoon-hee and Won-e……