Responses
Isekai Picnic is fantastic if you like horror and lesbians. It's atmospheric and weird is your into that.
The trifecta of horror rofan atm is probably How to Survive as a Maid in a Horror Game, Welcome to the Rose Manor, and The 100 Curses of Illeston Mansion. They all have servant maid type FLs and nobleman MLs and weird shit going on inside their manors.
I Was Possessed, but It Became a Ghost Story is another historical horror rofan but instead of being subjected to the horror she IS THE HORROR. Art is pretty good is in this one!
If your looking for something with a more modern setting then The Classmate is a decent manhwa.
Horror + romance recommandations
I'd like horror to be the main genree