I suggest you see the ghost hotel first, then the ghost boss, and finally the ghost world, otherwise you will be confused or unable to watch it. Most people think so. Because the ghost hotel is the first in the nine realms. I saw the ghost BOSS first, and I'm glad I saw this first, otherwise I wouldn't like Barr. After reading this book, I saw the ghost hotel, and finally the one you mentioned.

Ghost Hotel: Stone (Collection)+Isfield is a degenerate angel (Attack)

Kim (Vampire Attack)+Hughes (Invisible Man)

Antonio (werewolf chef)

Elf representative (it's complicated, because there are new people, and then there are others, you have to see them yourself. )

Leighton (dwarf)

Titan (the representative of the giant, later replaced because of the anti-Nine-Meeting)

The villain is Barr, mixed with the anti-Nine-Meeting and so on.

Mainly these people, there are some amateurs, from hell, Mamen, Abaddon, Poggi, etc., and Metatron is an angel (he and Mamen are a pair, and he is also the protagonist of the ghost world), and there are several amateurs.

Ghost boss

Wang Xiaoming (unlucky but kind, white and cute and funny)

Barr (degenerate angel) has a bad temper, arrogance and narcissism. ...

There are other people in it, as well as vampires, mainly because Barr wants Wang Xiaoming to live forever. My suggestion is to read this one first, and then there will be something extra, about a pair of vampires.

Ghost world:

The protagonist said, Mamam and Metatron, but I didn't watch them carefully, so I can't tell you more, because I don't feel as good as those two movies, haha, personal advice. Don't take it personally.