In a twist of fate, modern-day Li You finds himself in Xujiang County during the Daning Dynasty, stepping into the humble role of a yamen runner like his father before him. Mocked for his lowly status, he pens a poem for a humiliated songstress, Li Huan, only to have it gain unexpected fame. His talent earns the admiration of the county magistrate, and Li You's journey to success begins.

But with recognition comes complications. Caught in a bizarre marriage dispute, Li You becomes the son-in-law of both the martial Liu family and the wealthy Guan family. Trapped between two strong-willed women—Liu Xinyu and Guan Xiuxiu—he cleverly negotiates a three-year agreement to delay the choice.

Determined to gain his freedom, Li You rises as a respected poet known as the “Lyric Saint of Jiangnan,” excels in solving difficult cases, and makes his mark in the business world. His sense of justice brings him head-to-head with corrupt elites, earning him fame across the land. Yet as his star rises, both families find it harder to let him go. With the three-year deadline approaching, how will Li You choose—and can he truly escape his double son-in-law fate?