A modern person, Lu Chen, time-traveled to become a matrilocal son-in-law of the Shen family in the Da Sheng dynasty, enduring countless cold glares. Relying on his modern wisdom, he used fingerprinting in open court to clear himself of a murder suspicion, a Ci poem "Man Ting Fang" made him famous among courtesans, and a poem "Sympathy for the Peasants" made noble daughters of wealthy families feel ashamed of their inferiority. Relying on a copy of "Romance of the Three Kingdoms", he made a fortune, and further set up interlocking traps, using "Chinese mushrooms" to defeat the powerful enemy Pei family in one fell swoop, saving beauties from fire and water. During the Linchuan civil unrest, he fought fiercely against rioters, saved his wife and protected the empress dowager, rejected the empress dowager's recruitment, and chose to be a son-in-law who writes books in Linchuan, fully enjoying the blessings of everyone.