Oh, well I didn't know that but still I don't see it as a romance story (that's just my objective opinion, it's fine if you see it as romance), I feel that KS addresses many topics that romance is just not the main one but i strongly believe that in another life with different circumstances they could have been happy ( T﹏T )
I thought the author said the opposite? Im pretty sure the author explicitly stated when they started the manga it was meant to be horror story. It's literally a rumor where people are saying the author claimed Sangwoo loved Bum. Koogi explicitly lists the comic as a horror thriller on the official lol they def did not say it was a romance. I think you should look into that some more.
I don't understand how stories like "Killing stalking" aren't romance but this is.
Don't get me wrong, I don't take killing stalking as romance but I don't feel this is romance either (even tho it has the romance tag), I don't think you are wrong for liking this story (because I absolutely loved killing stalking) but I also think you shouldn't read this as romance because it's not...