Rule Horror? Isn't This a Mental Hospital?

The Protagonist Grew Up in a Strange World, Then Entered the Human World as an Adult, Only To...

Are there any books where the protagonist grows up in a world of the supernatural, then enters the human world as an adult? Then a rules-based horror scenario or a horror game descends, and the protagonist gets dragged in but isn't scared at all, pulling off all kinds of unbelievable moves? I really want something like that!

No Couples, No Women Fighting Over Men, No Putting Women Down to Praise Men, Female Characters in the Spotlight, and Rules-Horror

I want something like "Could I Really Get Canceled in a Rule-Breaking Horror Game? (Idol Survival Guide)". I'd like more stories about women, whether they're protagonists or villains. The main characters just need to be women, especially without any sneaky BL added in (I'm not even a kid and I'm still scared...)

Two Powerful Leads, a Top-Tier Wealthy Family, and Plenty of Drama

Like Baek Jina from "Cheongdam International High School" and her fiance. I love it when they love and hate each other. I really can't stand waiting for the show to come out. Please, I'm begging you all.

I Feel Like Nothing Can Grab My Interest Anymore. I'm in a Reading Slump...

The Protagonist Is Mentally Ill and Takes Part in a Supernatural Horror Game