This story is about an 18 year old. She has parents who are abusive towards each other. They make her worry and suffer in so many ways. When her bestfriend, Myungsoo finds out about her family. He decides to make deal with them. When the deal is made, Chaekyung gets engaged to Myungsoo. But because of everything going on, Myungsoo and Chaekyung have problems of their own. Will the two break of the engagement? Or will the deal go on?