Responses
It's absolutely a yaoi , but don't go in expecting "love" , atleast not a healthy one . It's more like a phsychological horror that comes under the yaoi tag. The bottom's gay and the top's ..straight(?). I think he does develop feelings for yoonbum as the story progressed or maybe i don't recall correctly.

After having it on hold for so long, I finally wanted to try Killing Stalking… Is it true, i heard that both of them are straight n that it’s not BL!!