Weapons as well as prostitution were banned in the North City. Strictly speaking, prostitutes were prohibited from entering North City, but occasionally, the guards at the city gates would not mind letting one or two of them get into the city. In the eyes of the guards, these girls posed no danger to public safety.
Recently, Slave Qing had acted upon Slave Huan's advice and tried to become Shangguan Fei's guide in South City. However, Master Fei worried that Tuo Nengya was waiting for a chance to assassinate him in South City and refused to go there. Every time someone invited him to go to South City, he would become suspicious of that person's intentions.
Fortunately, sometimes he would tell Slave Qing that he wanted to meet Xu Yanwei. Every time he made such a request, Slave Qing would hurriedly go out to bribe the guards to get the girl into North City.