Swapping Workshop for Middle-aged Couples: The young deputy Dong-sik and his wife, along with the middle-aged couple manager, went on a trip together as a couple. In fact, Dong-sik became involved in their friendship trip with ambitions for promotion. However, Dong-sik's wife, Eun-joo, takes care of her wives and is full of dissatisfaction because she seems to have become a helper for them instead of a trip. By chance, Dong-sik witnesses the manager's wife, Mal-sook, having an affair with her manager Seong-gil. In order to shut Dong-sik's mouth, Mal-sook starts her secret proposal...