
At least Sangwoo is not on that level of craziness.
He killed the gay guy because he was sexually assaulted.
He killed Bum's uncle because Bum was also sexually assaulted.
She killed the 2nd girl because he insulted and humiliated Bum.
But yeah, killing is not good guyz.

You see the reason why sangwoo killed bum's uncle is because he was also sexually assaulted (by his mom) so he thought bum was actually gonna like the opportunity to kill his uncle, it was his way to cope (definitely a fucked up one at that)
tho later we see that bum was not happy about it at all
I just think that's an interesting fact (I'm a huge fan of psychological horror so i search things about the stories a lot
I guess it's fine to leave the ending as it is. Making a happy ending to this story is just not good, and it will only be like any other corporate drama you see here.
Welcome bacc everyone