Sorry most of these are long but I still wanted to recommend cause horror is my fav genre!!!
Ghost gate - absolutely amazing and interesting plot, add it to your tbr for now cause the official translations aren't out yet and the scan team translation suck ass and will confuse you a lot but either ways it is really good
https://www.mangago.zone/read-manga/ghost_gate/
The Spooky Love Tale of Gongchan Seol - BESTT
https://www.mangago.zone/read-manga/tales_of_seol_gongchan/
Fate makes no mistakes - horror
https://www.mangago.zone/read-manga/fate_makes_no_mistakes/
Haunted by desire - horror
https://www.mangago.zone/read-manga/ghost_child/
A mail from my dead lover
https://www.mangago.zone/read-manga/a_mail_from_my_dead_lover/
Black mirror - horror
https://www.mangago.zone/read-manga/black_mirror/
Distorted soul - not exactly horror
https://www.mangago.zone/read-manga/twisted_soul/
To my creepy boy
https://www.mangago.zone/read-manga/to_my_creepy_boy/?_unavailableclick
That sexapparation - horror
https://www.mangago.zone/read-manga/that_sexapparition_mgs/
enjoy ( ◜‿◝ )♡
Nishin Masumi works like https://www.mangago.zone/read-manga/feeding_lamb/
The Orc Bride
Anyone have any good horror or mystery bl manga recommendations? I prefer jp manga specifically for this one since they tend to be shorter, but I'll take any manhwa/manhua with under 30 chapters!
Preferably with at least one volume completed.
For reference, my two favorites are "A Second Goodbye to You" and "Hikaru ga Shinda Natsu"! "MADK" was also very good!