The Tang Dynasty was the heyday of Chinese history, and Chang'an City (today's Xi'an) was one of the most prosperous cities in the world at that time. There are complex officialdom, bustling markets, mysterious palaces, as well as merchants and cultures from all over the world. This background provides rich material and broad space for the story. Mo Yanfeng came from an ordinary background. He might have been a young catcher in Chang'an City, or a scholar from a poor family.