
You're right. But I also think a lot has been shown from Bum's perspective, especially in the first season. Sangwoo's perspective is still a bit sketchy because I think the author doesn't want to reveal his motives just yet. It's sad if you re-read from the beginning and see Bum's mental state steadily decline. As readers, we don't know if what we're seeing is real or a figment of someone's psychosis. Maybe that's Koogi's intention. All we know is that they aren't right in the head. Seungbae has even had his moments where he seemed out of the loop. At this point, any theory is plausible.
what i'm actually concerned about is that neither bum nor sangwoo are reliable narrators, both are unstable so how can we tell if what we’ve seen so far it’s actually all /reality/ instead of /illusions/... i’m not denying the whole story, just some parts that could pretty much be explained as made up, especially considering how sangwoo has mistaken bum as his own mom (he could pretty much have a distorted reality)