My main problems with Killing Stalking are that it fails to be very good at anything it tries to be. MAL categorizes it as "Drama, Horror, Psychological" and "Yaoi."
Is it a drama? Somewhat. The character drama was okay, but lacking in some ways I can't describe.
Is it a horror? No. It was graphic, but nothing about this kept me on edge.
Is it psychological? Kind of. There are parts that made me think that were relevant to the story. Unfortunately, a good portion of my thinking was related to: Why am I reading this?
Is it a yaoi? It's boy x boy, but notice how romance is not one of the tags.
Do I recommend this? Absolutely not. If you want a good character drama with BL, read or watch Given or basically any BL by Rihito Takarai. Prefer something with colour and in webcomic format? Here U Are is pretty good. If you want a manhwa with drama, horror, and psychological elements, read Bastard instead. It far surpasses Killing Stalking in all of those categories. Sweet Home is also better than Killing Stalking in those categories despite being an action thriller. Point is, there are a lot of better options.
tl;dr: just read Bastard instead
