1. Miscreants And Mayhem (Yaoi)
https://www.mangago.zone/read-manga/open_board_dreamyzz/
(Not sure if link can work, but its bl and its kinda thriller imo bcus its a fked up relationship)
2. https://www.mangago.zone/read-manga/murderer_llewellyn_s_enchanting_dinner_invitation/
(This bl manhwa is abt well the guy thinking his neighbour is a killer, but im not sure if its on the level that will scare the shit outta u Σ(  ̄□ ̄||)
how bout this? https://www.mangago.zone/read-manga/survive_romance/ ヾ(❀╹◡╹)ノ~
I'm cool with anything as long it revolves around romance (bl,gl,straight) and at the same time horror/thriller/scary
I've read some horror manhwa/manga such as "How to survive as maid in a horror game" and "Dreadful night" so far they got some interesting plot I want something to scare the living shit out of me while at the same time me rooting for a ship lol. I'm also fine with supernatural too ^^!