I really do think that the story is not yet finished. Considering the story is still on the 'Killing' part which the last chapter ended that part. I think we do yet have to see the 'Stalking' part where Sangwoo's not really dead and will eventually stalk Bum. Just my theory tho.
The next chapter resembles a lot to KS. But I still have hopes for this to go to a different plot.