The humble son-in-law Li You (Guan Yunpeng) came to Xujiang County in the Daning Dynasty and became a yamen runner. The little yamen runner was ridiculed, and Li You angrily gave poems to the equally humiliated singer Li Huan (Shi Yufei). Unexpectedly, he became famous and became an elegant official, and even attracted the appreciation of the county magistrate (Li Xizi). The road to success is opening up, but I didn't expect that talented boys are also dangerous. Li You was robbed by military officer Liu Xunjian (Xu Jinjiang) and wealthy businessman Guan Yuanwai (Yan Feng) at the same time, and became a son-in-law of two families by mistake. Who knows that he is still a son-in-law in time and space, and has been upgraded to one son-in-law and two sons-in-law! Fortunately, Li You is smart and made a three-year agreement, but he is in a dilemma under the offensive of Liu Xinyu (Yu Menghan) and Guan Xiuxiu (Song Xiaoyingzi). For freedom, Li You worked hard to make progress, became famous in the literary world and was hailed as the Jiangnan Ci Saint, repeatedly solved strange cases in the county government and rose step by step, and turned stones into gold in the mall. His sense of justice made him fearless of the evil forces such as the Yan family and the county magistrate, and he pleaded for the people, making him famous in the court and the country. However, he became more and more dazzling, and the Guan and Liu families also found it increasingly difficult to let go of this son-in-law. How did this three-year agreement end?