C2666 The Great Dao's Voice

Lau Yiheng noticed that every time the sound of the zither was played, the light from the diamonds on the wall would change. However, because the sound of the zither was transmitted one by one, Lau Yiheng and Di Hongyan did not find any pattern on the wall. However, they were not in a hurry. After all, they had just entered, and there should be changes in a while