We officially lost Bum. Instead of looking at the symbolism with the closet I jus...

We lost Bum a long time ago when he killed Jieun.

Yes but no (?) Bum didn't have any previous feelings for her, he wasn't attached in any deep way. This is another scenery, even though he wasn't the actual murderer the emotional weight this time is heavy af...or at least that's what I think because of what Koogi showed us: Bum's "happy" childhood with his uncle. He does have good feelings.
Something that is also really different is that Bum doesn't seem to acknowledge his dead unlike with the other ones tho

nahhhhhhh wdym

Just my opinion, but after he accidentally killed her, I felt as if his character had less hope and less of a chance to get out of this situation alive. He's basically given his whole life, his mind and body to Sangwoo. It's foolish of him to ever think Sangwoo is being nice or that everything is normal and fine just because Sangwoo is showing "affection". He's a captive! Maybe this is a turning point though. Or maybe Bum has lost that last tiny bit of sanity that he held on to. Who knows at this point what's real to the characters or what may be a hallucination? ╮(￣▽￣)╭

Well I think this will be his comeback, he's angry at Sangwoo now, he completely realized what Sangwoo is. Back in S1, when Bum got angry for once, Sangwoo would almost drown him.
But Bum's more confident now and Sangwoo didn't punish him. I think this will be his downfall, he abused him and made him do things and finally got his grudge now.

Koogi usually uses special colour shadows to show what's a hallucination and what not, but at this point, I dun even know anymore.

Oh, that's a good way to see it. Now I'm more curious of how Bum is going to interact with Sangwoo in the next chapters lol. We know for a fact that Bum has enough courage to do something against Sangwoo but vfuyg you never know
Something is sure, Bum is not sane (?