Obey Me
This isn't Yaoi. I mean where's the love ? Definately not between the main characters. It's dark and twisted. It's alright kn its own ways. But nowhere near killing stalking. The plot is wayy different then KS. It's rather short so you can give it a read
Killing Stalking
Must give it a read if psychological thriller is your Jam. I absolutely loved it from beginning till end, it had me hooked. I have a love hate relationship with the characters
Warehouse
This is so twisted, I can't get over it. There's one thing tho, that I didn't quite understand is why Doghun forgot about Sungoo ? Did he have a memory problem or he meant to forget everything? Just that part. Good parts - The character development of young Sunghoo and Doghyun. Their happiness and pain. The ending, altho a very toxic relationship as it would seem you somehow want these 2 to end up together after having gone through so much. It's a good read. The genre is definitely similar to Killing stalking but different at the same time.
Hotel Phryne
If you've reached this manhwa, READ IT. Not for the BL, but for the plot. It will definitely make you think. Loved it
Black Mirror