He is your ex boyfriend, he is your greatest love. But you both break up cause of just a small misunderstanding(you can't move on from jeonghan), you both are living in the same house.but now you both broke up, you both are still living in the same house. But with his new girlfriend yeri, his past relationship with you. Is just a same relationship with you, but much stronger relationship. In past few months it's still the same set up