Chu Feng, a modern special forces soldier, accidentally travels back in time to the chaotic era of Great Yan and is captured by a female army guarding the border. Murong Yan, the Grand Princess of Great Yan, mistakes him for a descendant of the Mohist school after seeing his unusual equipment and invites him to join forces with her to restore the kingdom. Factional struggles rage within the fortress, while an army of 100,000 northern barbarians threatens the city from outside. Trapped in a desperate situation, Chu Feng reveals his extraordinary abilities. From then on, he leads the female army, relying on his strategic brilliance and martial prowess to overcome one challenge after another, wage wars across the land, and ultimately claim the throne as ruler of the world.