The Simpleton Son-in-law of the Sui-Tang Transition: Helping the Li Family Forge a Golden Age

The protagonist, under the guise of a fool, roams freely between the court and the streets, using modern engineering thinking, grassroots livelihood knowledge, and cutting-edge business logic to outsmart aristocratic clans, resolve deadly court intrigues, and assist the Li family in unifying the realm. He stumbles into comedic mishaps daily but turns the tide at critical moments, earning the emperor's favor, the officials' exasperation, and the people's eventual admiration. — Description from novelcodex.org