Lin Wan, a senior engineering data clerk of ten years in the modern era, accidentally time-travels to the Daqi Dynasty. Relying on ancient architectural restoration knowledge and standardized construction concepts, she shatters ancient architectural perceptions. From topping out the Hall of Prayer for Good Harvests in the rain and repairing the century-old stubborn ailment of the Coiled Dragon Ancient Bridge, to using surveying and mapping for water control to eradicate Beijing's accumulated flooding, she leaps to become a Grand Preceptor of Construction of the second rank. Faced with the deliberate difficulties created by Prince Jing, she accepts the critical mission to travel south to Huaizhou to manage a thousand miles of river dykes. Even when encountering heavy obstacles such as dossier falsification and materials and manpower being covertly obstructed, Lin Wan relies on on-site surveys and modern engineering techniques to maneuver with local forces, confronting the hazards of the great river with blueprints and craftsmanship, and rewriting ancient construction history.