Su Mo accidentally acquires a mysterious leather bag that can connect with the ancient Great Xia dynasty. Learning that Empress Lin Xi is leading soldiers and civilians in a desperate defense of Yancheng to protect the people, he resolutely uses modern supplies to provide cross-time support. He continuously sends water, food, and advanced equipment to help Lin Xi repel the invading enemy forces and stabilize the crisis. In return, Lin Xi gifts him ancient treasures, helping Su Mo walk out of his life trough and restart his career. Crossing time and space, the two watch over each other with dual-direction devotion, weathering difficulties with kindness and responsibility, and writing a warm legend of protecting the common people and achieving mutual success.