1. In the game "Sailing Against the Current", go to the coordinate position of Dongji Island, find NPC and have a dialogue.
2. Open all the holes on the map according to the prompts, then go to Dongji Island to open the floodgate and enter the spiral hole, and find a blue butterfly in the depths of the cave.
3. Opening the treasure chest in the cave can get the action of "holding the thigh", which is another important proof of Xiaoyao Gate.