Shen Yan, a top student in the history department, accidentally traveled to the late Ming Dynasty and became the guardian of Jiayu Pass. At that time, the cavalry of the Qing army outside the pass was watching eagerly. Inside the pass, there were only a few soldiers and a lack of food and grass. The supervisory army was constrained by internal and external troubles. Facing a desperate situation, Shen Yan relied on historical insights and engineering wisdom that transcended the times to eliminate traitors, train new soldiers, unite the Mongolian troops, and build a strong city. Using Jiayuguan as a chessboard and modern knowledge as a weapon, he started a thrilling game of wisdom and courage with Dorgon. Let's see how a scholar turns the tide in this troubled world, defends the country, and gradually uncovers the greater mystery behind the time travel, rewriting the final chapter of China's destiny.
