Xiao Zhenbei, an ancient general defending Shazhou, has held the city for three years. With food supplies exhausted and soldiers dwindling, he unexpectedly travels to the modern world through a secret compartment in an outhouse. After witnessing modern supplies and technology, he earns money by doing construction work and selling ancient artifacts while learning new knowledge. Using flashlights, trucks, construction machinery, and other modern resources, he travels back and forth between the two worlds. He uses modern weapons and equipment to repel foreign enemies, introduces high-yield potato seeds, strengthens the city's defenses, and provides shelter for large numbers of refugees, transforming Shazhou's livelihood and fortifications. As the new city walls finally close into a complete circuit and Shazhou's population continues to grow, however, the new Khan of Lou issues an order for a western expedition, sending a massive army toward the city. Xiao Zhenbei leads soldiers and civilians into an epic battle, and the first season ends on the eve of the decisive confrontation.