Modern young man Chen Fan accidentally traveled to the Qin Dynasty and became the master of Emperor Ying Zheng in the form of an immortal. Chen Fan and Ying Zheng formed a deep friendship between emperor and minister, and witnessed the prosperous age of the Qin Dynasty from the unification of six countries to the coming of all nations to the dynasty. In the end, the mission was completed, and Chen Fan's soul returned to modern times. Ying Zheng was left alone to guard the prosperous age of the Qin Dynasty, only to miss him, but the fetters across time and space still continued in the dark.