During a competition between the two major families, the Zhuo family and the Guan family had to use their trump card to do some dirty things. Unexpectedly, the Chen family and the Xuan family had a strong foundation and soon learned that it was their method. In order to compromise with each other and never offend, they had to sign an agreement to live in harmony forever. At a dinner after the ceremony, the four of them started to interact with each other. After getting to know each other, they went to the KTV "Xuan Nuo Nest" to sing for a long time, and then they did not contact each other much until half a year later, they met at "Xuan Nuo Xuan"...