How to trigger the mural task of Hatch Island?

1. First, the player needs to complete the world mission of Wang Long Village in Haidao, and then go to the NPC scroll for divination. 2. After the player gets the clue of the South Cave, he can start exploring and collecting strange signs. Strange mark task reward: after the player completes the mark collection, he can unlock the treasure and integrity that made the shepherd in the open sea.