As you knew of it, your current Moon ain't himself. It's like his insanity and his impossible goal of bringing his brother back is swallowing him whole. And honestly, you and the others can agree that you wished this never happened.

..So let's make it a dream come true! :)

So after you and Moon's brother Sun got sucked into the portal to a different..area? Dimension? Whatever it is, You were able to hear your Sun talk to this dimension's Moon. Which gave you time to question this place.