What’s the Worst Dark Yaoi You’ve Ever Read

I'm curious about the worst yaoi you've ever read. One that still made you hate and detest the characters.
For me, "Hogu Hagyeongsu" was a nightmare when I was younger. it's one of the first dark ones I encountered (I couldn't finish it back then, I still haven't, even though there is much darker ones out there that I've somehow managed to read )

What's yours?