Chapter 323 Little Devil, Where Are You From_3

Dragon-slaying Knight Saint George possessed Heavenly Blood, or rather, he was a primal Angel who had descended to the Mortal World.

Once, angels and devils could enter the God-chosen Continent.

Wayne had obtained a Holy Shroud/Shroud, originally kept in Saint Dominic Cathedral, but Saint Dominic was neither human nor angel—his veins carried Hell Blood, he was a descendant of a devil, bathed in Holy Light to gain entry into Heaven.

Devils having bloodline descendants in the Mortal World and the Windsor Royal Family possessing Heavenly Blood, these are the strong proofs that devils and angels once freely traveled to the Mortal World.

Moreover, the Grey Space was indeed a Divine Nation of a fallen Giant Dragon, and for Giant Dragons, Divine Nation specifically refers to the Dragon Kingdom.