Poor Boy...

I dont think he’ll rape her

Well earlier at the start of the manga he did say he killed both his parents and all the cops did was offer him some gum, mom is cute af, dads a stupid fucker who has such a cute wife and sweet child to fuck it up over some hoe he probably had an affair with, so the reason y Sangwoo is so fucked up is bcuz of his dad, I mean to think that a child would go so far as to bare the pains of a fever just not to c his mom gets hurt, I'd strangle that father with a thong and feed him his balls and if he throws it up hes eating it again and again til non is left, I hate it how men can use the women they once love before as a punching bag and even hate their own kids especially when they get lay off from work and can't find another job

(づ￣ v￣)づ

Sangwoo, like Bum, isn't a reliable narrator. We can see this more clearly from the visual representations, but also how the verbally interpret what has happened to them, and how they think they should react. At this stage I really do not think Sangwoo killed his dad, or his mum. I've thought that as soon as he made the claim god knows how many chapters ago. Sangwoo was traumatised by his codependent relationship with his mum. It's his mum who "haunts" him in his nightmares, not images of his dead dad. He had to grow up in an environment where both parents were abusive, and his mum had deteriorating mental health, which has impacted his own mental wellbeing today. My theory is, the Mum killed the Dad, presumably with a knife. She then told Sangwoo about this, maybe told Sangwoo why in her mindset this was the right decision. Sangwoo then helped her move and bury the body. In Sangwoo's perspective he blamed himself for his dad hitting his mum, and he probably felt involved in the murder due to having to move the body. "I killed him" shouldn't be taken literally. But who knows.

Yes, I have to agree: witnessing the downward spiral of your own mother's mental health will definitely have an effect on you. How your father abuses your mother day in and day out, how your mother slowly but surely loses her mind while she still tries to shield you from the blows but gives up on protecting herself. I can only imagine the guilt, the pain, the hopelessness young Sangwoo felt. He probably didn't think or believe that there'd be an end to his living nightmare before THAT NIGHT happened.

But cheese and crackers, I'm so scared and worried about how far he and his mother went just to cope with their environment. I feel like his mom crossed a line --
physically or emotionally, I don't know -- before she finally decided to end it all. Because, honestly, it's hard for me to believe that being a bystander of two mentally unstable people will literally make you a psychotic killer. It's likely that you'll end up as a shell or a recluse, but a murderer? There must have been some trauma that directly happened to him or something.

Or maybe becoming a psycho isn't that hard after all? Years and years of watching and cohabiting with mentally unstable people might actually do it, gradually wearing you down until your mind goes over drive so as not to breakdown.

Maybe someone can look back on the apple eating scene where there was a flashback to Sangwoo thinking he was carrying his dad's body to be buried (I say thinking, because both Bum and Sangwoo's flashbacks and nightmares are only their interpretation rather than solid evidence). If Sangwoo is seeing himself looking the same as he did when his mum told him "I've got a secret" then maybe a link as to when this correlates with the murder of his dad can take place. She might have already killed him at this point, or this might be just something she is planning. Another theory could be that the mum wanted a double suicide with her son, but the dad tried to step in to prevent this and the mum attacked the dad, killing him.

It's an interesting plot that we are gradually getting an understanding of, chapter by chapter.

The possibility if the double suicide is disturbing but interesting.

I think maybe the mother killed the father and asked Sangwoo for help, which he obviously gave since he hated his father and had always depended on his mother. Then the mother tried to convince him of double suicide, but Sangwoo somehow didn't give in, and the mother simply continued with the plan and killed herself. Sangwoo blamed himself for both not stopping her and not having gone with her wishes, and that's why even though he didn't directly killed her, he did kill her indirectly.

That's the only way I can see Sangwoo "killing" his mom now that I think about it. He's way too dependant on her to simply kill her off.