Awww I’m sorry but I have no recs, only thing similar to this I can think of is “Basketball, murder love” (I think that’s the name) but it is a really bad manwha.
Now if you want a great revenge BL story the top notch is for sure “The beast must die”, this one is a MASTERPIECE. But I feel like it’s very different vibes from "Koisuru psycho no shirayuki kun" and “Maria no Danzai“. Still so worth it though, the best manga showing what a gay relationship with a diagnosed psychopath with strong murderous tendencies could be like. The mystery and thriller is great too. But there’s no horror/gore like from "Koisuru psycho no shirayuki kun" and “Maria no Danzai”, no bullying and highschool setting either.
Read this at a single sitting after I caught up to the latest updates for that yaoi revenge similar Manga and I must say lmaoooooo the comments. I was depressed Maria's son died so horribly and that their family is broken beyond repair but I'm gonna use comments as a coping mechanism lmfao I love yall