Tang Bao is the owner of Weiyang Merchant located in the Blissful Retreat area. Here is his exact location on the map:
The best way to find Tang Bao is to teleport to Blissful Retreat boundary stone and walk straight just a little bit and you'll see his location:
You go next to him and press the interact button, and select: see's what he's selling...
After the interaction, you will see what he has to sell inside the Weiyang Merchant.
You can find anything from Morale Chant Page inner way fragment to Large Tuning materials, and to decoration props for your future home.
Tang Bao sells everything in Echo Jade, so make sure you have enough Echo Jade to buy it from hime.
Tang Bao is also the first location that you need to come if you're trying to unlock the Morale Chant inner way.
Overall, Tang Bao is a NPC in Where Winds Meet that doesn't have an exact location on the map, so you need to find him by using the nearest Blissful retreat boundary stone.
End.