He is inside the large temple at the center of the isle. If you have difficulty spotting him, you can use this method.
- click the magnifying glass next to the minimap on your screen; check-mark "Target" if is not already.
- /targetexact spirit of master shang xi
- on the minimap, look for a green dot with gold around it; or use your character to look around for a highlighted NPC. (It will look somewhat brighter than usual and its name will appear above its head.)