Panjiayuan Basement Nine Floors

My name is Su Wanqing. I live on the street in Panjiayuan and am known as Mr. Su. A "Map of the Nine Underground Levels of the Capital City" was dug out from a crack in the wall of the shop left by the ancestors. The city marked on the map is older than the Forbidden City, but there is no mention of it in the history books. From then on, during the day I was a gangster hanging out with policemen in the alley, and at night I was a grave-goer with a Luoyang shovel in my hand and a bronze compass on my back. When those forces who are interested in underground secrets come to visit, I just want to say: "Everyone, you have crossed the line."