Lin Wei, a top modern mechanical engineer, accidentally traveled to the Qingli period of the Northern Song Dynasty while debugging a drone in the laboratory. As soon as she landed, she was trapped in a bandit den in the Liao border. Fortunately, she was rescued by Qin Zhao, the guard of Yanmen Pass. Faced with the war between Song and Liao and Song and Xia and the dilemma of the Song Dynasty's weakness, she decided to use the scientific and technological knowledge of a thousand years later to carve out a path to protect the country in the cold weapon era.
