Once the mailbox became successful, after the modification to make it Element-proof, it became a huge hit. And everyone in the Kingdom, nobles and commoners alike, now have mailboxes in their homes.
And as soon as the Empires of Aster and Kyte heard of this, they asked permission from the Emperor of Constanz if they, too, can utilize the mailboxes for their citizens in their own Kingdom.
The Empire of Constanz agreed and was generous enough to give the blueprint to the Empires' trusted representatives for free.
'Such amazing and useful invention that can benefit the people and make life a little easier is more important than earning money.'
Was what the Emperor of Constanz said to the press. His words were printed on every paper in the three Empires.
'The Empire of Constanz is already
