C1431 Yin Yang Throat!

We carefully looked at the golden door in front of us, but we didn't know how to open it! There were some messy things carved on the golden door, which made us dazzled. On top of the door, there was also a ferocious beast's face carved on it. We didn't know what kind of monster it was. However, all of them had their mouths wide open. Their mouths were as big as a person's fist