How to use the white silver coin sent by the legend of ghosts and gods

It was used to go to the NPC in Atlantis Square. I don't remember the coordinates. Look at the map. Atlantis Square is divided in half by a middle road. There are five vendors on the top of the business circle, and two NPCs on the west side of the vendors are one of them to exchange such things. The two black dots in the attached figure are the approximate locations of NPC (image provided by Baidu Image).