C1026 Dispute

When Chung Yuebai saw the black sun, she calmed down a lot. She was no longer determined to move forward like before. On the contrary, Chung Yuebai quieted down as she pondered over the principles behind the black sun.

What is it that makes the sun black, and does not affect its light? Could it be that this black sun could only be seen in Yinkun Mountain?

In other words