William couldn't possibly maintain his silver hair and the swirling nebula (upper body shirtless) state forever, so there was no need to disguise himself as the so-called Queen.
"Um... City Lord, you may have mistaken me for someone else."
Faced with William's denial of identity, the silver-haired rat in front of him was not swayed, "I couldn't be mistaken~ I personally witnessed your death and the fall of the moon during the war.
After that, even with all the knowledge I acquired throughout my life, I was unable to create even a piece of moonstone the size of a fingernail cap. That's why I am certain that the war caused the Old World to lose the 'concept of the moon,' and it's impossible for anyone other than you to create a new moon.
Now, seeing a completely different new moon on you, it has to be related to you! You must be the reincarnation of Queen Fisney."
Oh dear.