Cao Sheng is the owner of Studio of Calligraphy located in the Fairgrounds area. Here is his exact location on the map:
The best way to find Cao Sheng is to teleport to Grand Imperial Temple boundary stone and walk straight then go down the stairs and you’ll see his store:
Note: If you can’t see Cao Sheng in front of the store, walk into the back room and you will see him sitting there.
When first interacting with Cao Sheng you can check out what he sells in his store or you can ask about a special treasure.
If you choose the first option, you can buy artwork items for your future home. He sells these items in coin currency.
If you choose the second option which asks him about the special treasure, you can buy Seasonal Edge: Page which is used for unlocking the Seasonal Edge inner way.
Also note that he sells the Seasonal Edge page item in Echo jade currency, so make sure you have enough.
In conclusion, Cao Sheng shop doesn’t have any fancy items beside the Seasonal Edge inner way unlock item, and the quickest way to find him is to teleport from the Grand Imperial Temple boundary stone.
End.