Fan Casting Modern Monsters

Monsters living in the normal world? Sounds crazy right? So unrealistic. So it seems. Monsters now live undercover in the human world disguised as humans. There's phantoms, oni, succubus, werewolves and more. Unbeliveable right? Only to find out that they are actually dead. They're like zombies but instead of going to heaven or hell, they go to the underworld where they get transformed into monsters and are given a choice to continue living disguised humans in the human world or to continue living in the underworld for thre rest of eternity.