A slightly twisted tale about the fate of Park SoHee and Oh SeHun, who have to go through a lot to be able to live normally. They both meet thanks to their mutual friend Kim JongDae. SeHun offers the girl a marriage contract, and Park agrees to it, without even thinking about it for a long time. Sometime later, their lives are disturbed by the sudden appearance of Kang HyunNy, an ex-girlfriend of Oh SeHun who is jealous of him and wants to get him back. At first, they both do not like each other, but certain circumstances make them start to get along and be friends. What will happen between these heroes and their loved ones?