A doctor of modern ancient literature traveled to the fictional dynasty "Da Yu". With his deep understanding of ancient classics, political systems, and cultural etiquette, he managed step by step in troubled times and counterattacked from a down-and-out scholar to the prime minister of the current dynasty. The story combines historical intrigue, cultural collision, and emotional entanglement, showing the theme of "knowledge is power" while exploring the choices between ideals and reality, loyalty and contingency, love and family and country.