
I think the author just foreshadowed the ending...

I really hope she's just making us believe that.
Bum said okay, but there was a short silence before he agreed wit him.
He doesn't want to die, the best proof for that is before Sangwoo killed the old man.
And Sangwoo's "most painful death" makes me believe that he'll die, but not the way he wants, in short, Bum won't commit suicide.
This weirdo just straight up starts molesting him right in front of kyle...obsessed much?
he's so EWWWW