It could be a mysterious figure from another dimension. In a more fantastical version of the story, this uninvited guest could be a being that has accidentally slipped through a portal during the game. They have no idea about the world they've entered or the rules of the game, but their presence causes all sorts of strange things to happen.
I'm not sure specifically as I haven't read it. But generally, a novel with such a title might be about a character or situation where an unexpected person arrives and disrupts the normal course of events in the story.
It's about a southern ghost story. Maybe it involves the appearance of uninvited spirits in a southern setting, with elements like old southern mansions, family secrets, and the spooky events that unfold when these uninvited entities show up.
For novels like Nuan Nuan's Uninvited Wolf, you can refer to the following examples:
1." The Tyrant's Favorite Concubine "
2. Poisonous Bastard Daughters
3. Demonic Patriarch
4 "Thousand Bones of Flowers"
[Chu Qiao's Biography]
6. Feng Qiuhuang
Ruyi Biography
8 Fuyao
9 "Unique in the World"
Palace Heart Locking Jade
These novels were all popular online literature works with rich plots and character creation. They were worth reading.
I'm not sure specifically as I haven't read it in detail. But perhaps there could be stories about encounters with uninvited ghosts, their motives, and how people deal with them.
If it's someone you don't really know well, it might be a good idea to not let them in at all. You can talk through the door or a window. Say something like 'I'm sorry, but we are not expecting any guests today and it's not a good time for visitors. Please call next time before coming over.'
One homeowner came home to find a group of teenagers had broken into their empty summer house. They had thrown a wild party there. There was broken furniture, graffiti on the walls, and a lot of alcohol bottles everywhere. The homeowner had to deal with the police to find the culprits and then spent a fortune on cleaning and repairs. It was a horrible experience to see their beloved property trashed by these uninvited guests.
The 'uninvited guest game story' might involve a virtual reality game. The players are in the middle of an intense gaming session when an uninvited character appears in the game world. This character could be a hacker or a glitch that has a mind of its own, and the players have to figure out how to deal with it while also trying to win the game.