
-------SPOILERS---------
I'm sorry but this open-for-interpretation-ending really gets to me. I really hoped that Bum would see Sangwoo, talk to him, give him the ring and then kill them both off. Let them be happy together in death you know?
I mean we knew it wouldn't be a happy ending, but Sangwoo dying by the hands of some old lady, crying out for Bum is just too stupid and, frankly, too sad.
I need more closure and certainty of what happended. It's definetly possible that the guy in the elevator is Sangwoo and it's possible with the Bum dreaming theory. Anything's possible in Koogis messed up universe, but this ending is too open and stressful for me

Soooo am I the only one thinkinh that the murder case on the TV might be about Bum and Sangwoo? I mean Sangwoo is 22 years old now right? And Bum went batshit in the previous chapter.... But then again that would be a disappointing ending for Sangwoo. But I feel like Bum and/or Sangwoo was involved, since the murder was even mentioned. Anyone feel me?

Interesting theory. Bum usually uses a knife to commit physical harm too. 3 people (we know of) have been killed in Sangwoo's house, and the police are oblivious.... Therefore maybe Bum would have drawn attention to his murder, by telling someone on the street, or contacting the police himself? It would seem like quite an abrupt and sad end though, maybe this is the final series?

*4 persons(which we know off). Sangwoo killed someone off-screen in Chapter 5.
Bum is still in the closet while Sangwoo went outside.
And we know how he is when he takes his anger on something else out.
He probably went out to kill the guy he had contact with.
http://www.mangago.zone/read-manga/killing_stalking/mf/m_chapter-39/pg-19/.

Looks like it would have been one of his uni mates, I doubt he would kill any of them now. Also, we don't know the timeline of Seungbae's chapter, it might not be parallel to the last one, it could be a few days after for example. Sangwoo returning to the house, or to the bedroom and then being stabbed by Bum could be a possibility. Who was the 4th murder in the Oh household? We have only seen first woman who was the daughter of someone of status, the man Sangwoo took home from the bar, and Jiuen who was his university friend.

Made a mistake, there was 4 murders shown, forgot about the uncle!
- So murders shown that happened in the Oh house, or spoken about
* Woman who Bum found tied up, method, head injury caused by hammer
* Man from the bar, method, knife injury
* Jiuen, method knife injury
* Bum's uncle, method knife injury
Think that was all? It seems likely that Sangwoo's dad died somewhere else, seeing as he was shown trying to run away from his wife and son. But the parent's death is still fairly unexplained.

Weil he did say they're a bunch of nuisances, especially Jieun and that he's going to change them later. And since hes currently probably angry, I wouldn't exclude that he killed the buddy who annoyed him(in Sangwoo's eyes).
Sangwoo dying now is highly unrealistic, we still need to see the whole truth about his past.
Actually, nvm, it's been 5.
CEO Daughter, Woman in Chap 5, Old Man from the bar, Jieun and the uncle.

I in an interview a while back where Koogi said KS would only be 3-4 seasons, so I guess we're getting close to the end of the series.
But yeah it's probably that friend of Sangwoo who's been annoying him over the phone, who Sangwoo's killed. Assuming that Sangwoo's the murderer this time (too).
Of course it's highly unlikely that Bum killed Sangwoo before we get to know the truth about both of their parents deaths, but on the other hand Koogi's got mad plot twist skills and she's bending this story in some exciting and messed up directions

I'm not too sure, but I guess the author wouldn't just mention a random murder, so it could be likely. Sangwoo goes to his friends house, after being rejected by Bum and due to the phone calls. He's on edge due to this, but his friend adds to this by bringing up Jiuen. Then he stabs him, the victim might not be in such an isolated situation as Sangwoo, so neighbours or the police etc discover the body quickly. Who knows, the last time he felt rejected by Bum he went through this massive panic and mood swing, whereas this time, he just left...?
Oven! Noooooooo!
Aaahahaha I'm so done