Between the demon world and the demon world, there is a realm of nothingness - the dream world.
The dream world is roughly divided into two types - dream monsters and nightmares. They exist in the form of smoke of nothingness, doing the same job as puppets - entrusting dreams.
However, there is an exception for one species. They are endowed with rich emotions and survive as entities. They are worshiped by incubi and nightmares, and given the name -
Like a dream.
But such a god-like existence has a flaw that is on the verge of extinction - they can only use their abilities once, and then they disappear.
When Rumengling was on the verge of extinction, King Meng made a decision - to transform Rumengling.
However, after the transformation, Rumengling turned into an illegal monster - understanding but ruthless, slow to recover, and needed to rely on blood-sucking to gain speed of recovery.
Ru Mengling, who is no different from a vampire, escaped the pursuit of the divine world through the protection of the Meng King and was dropped into the human world.
However, there was one Ru Meng Ling who finally transformed, running strong and independently under the sun, until it turned into light foam.