Gray Zone Warfare offers many quests to complete. They can be quite lucrative, as they are a good way to get some additional rewards. One of them is Shadow Over Ban Pa. It’s a beginning of quite mysterious story. You have to go to titular Ban Pa and investigate entries to the village. Rumor is that it has been taken over cultists.
Shadow Over Ban Pa in Gray Zone Warfare (GZW): Southern and Northers Entries
To complete the Shadow Over Ban Pa mission you have to go to Ban Pa, obviously. This fishing village is located on the eastern part of the island. It is near to the center of the map, on a bay.