Ling Yun, a modern elite, travels through the Qin Dynasty and saves young Ying Zheng from an assassination attempt. With his knowledge and strategies that transcended the times, he helped him eliminate political opponents, implement the New Deal, and use technology and tactics to accelerate the unification of the world. After the establishment of the empire, faced with Ying Zheng's tyrannical tendencies and the obstruction of mysterious forces, Ling Yun turned the tide when the empire collapsed, and finally went overseas with the resurrected Ying Zheng to create a new civilization together and become the eternal guardian of history.
