You Shang first appeared in Wuchang, in order to trigger the story that Murong Yan would come out to greet everyone after taking them to the port. At this time, the weapon was sold by the male owner.
The second encounter with Luoyang will also trigger the plot. I had to see the businessman in the plot where the Iron Lady led the team to save the man in the prison. After the rescue, I can't find him anymore. The plot will force you to take the route, but I can't move freely.
The third time I saw him was in Guangling, Gaojia Office, and I could find him myself. The weapon I sell at this time is+Lan _.