1. First we talk to Di Sanxian, let us return to the secret base to look for clues. We can find clues on the wood in the secret base and get the number 0.

2. We then follow the prompts and go to a sparsely populated place to look for clues. Walking down from the secret base, you can see the note pressed under the tree and get the number 8.

3. Then we go to the restaurant, and we can see a glowing point on the roof of the restaurant. This is the place with the highest task clues, and you can get the number 2.

4. Finally, we go to the fountain pool of the villa and we can get the last number 4. Then we can go back to find Di Sanxian to open the treasure, and the password for the treasure is the four numbers found above - 0824. Then we can open the treasure box and complete Liangbu's treasure exploration mission.