Demon-Killing Tribulation

Middle-earth is vast and vast, and the land spreads to one hundred thousand miles, and no one knows where its edges are. There are several countries standing on the continent, including Donglong, Chu, Yan, Zhao, and the most powerful and geographically awkward Great Qin Empire. As a knowledgeable doctor, Qin Fei had no choice but to encounter a "legendary" time travel, and he had to bear a system that could be punished at any time.