Horror BL

Ghost gate but still ongoing tho

omg murderer lewellyn's enchanting dinner invitation is one of my all time favorites!!

https://www.mangago.zone/read-manga/epitaph_perfume/

https://www.mangago.zone/read-manga/madk/

https://www.mangago.zone/read-manga/criminal_interview/ (this one is more of a psychological/mystery like lewellyn's story)

https://www.mangago.zone/read-manga/heartless/

these are all top tier hidden gem stories