I’m sorry for Sangwoo

"but I wuold like to say that if it wasn’t for his mother, he clearly wouldn’t end up like this."

Everyone already knows this. It's not like Serial Killer became Serial Killers for reason or Abusers Abusers.

Yeah, I know, that’s right. I just wanted to point that out, because I feel like some people don’t fully understand how much demage Sangwoo suffered and how this completly ruined his life.
But you are right, everyone knows about his mother.

They understand. Not everyone can sympathize with someone like him though. His past was ruined so he ended the lives of x people and ruined families because of that.

I disagree with you, unfortunately. Maybe his past makes him sympathy with him and yes, his mother was twisted and cruel. But I do not feel bad for him what happens now. He did so many bad things, so many incriminating things I can't overlook. I think in the beginning he knew what he was doing. Maybe he should not die and rather reflect on what he'd done wrong but I don't think this is going to happen..

And most of the serial killers IRL have a traumatic past. An abusive past. Are u gonna miss them too?

That’s your opinion and I accept it but I disagree.
Whit my past comment, I did’t try to say that I like serial killers or that I will miss them all, so I’ll try to explain myself better.
You said that Sangwoo, at the beginning was aware of what he was doing but I don’t think so.
His parents (also is father did, we can say, but mostly his mother) messed so much with his brain that at the end, his perception of life and his own head completely crashed. For this reason I think that when he committed the homicides, he wasn’t able to understand the situation fully, or to sympathy whit people feelings while doing it. That’s my thought but whit this I’m not trying to excuse Sangwoo’s behaviour, he killed people and that’s the truth; I’m just saying that his completely fucked up mind is not his fault. When he was younger, he was a completely normal kid, but at some point the situation became totally unbearable due to his mother and I can’t overlook it.
I feel like you underestimate his past problems, if we can call them this way (I’m not trying to insult with this, it’s just an opinion, I can be wrong). However from my point of view, what Sangwoo experienced, was way too much to overcome. It was completely, unmotivated violence toward him and for this reason I can’t accept his death.
That’s also why I’ll miss him, because despite he suffered so much in his life he ended up achieving nothing but other pain. He would deserved better and at least a little bit of happiness.
I want to add that, regardless all his actions, I really like Sangwoo’s character. I get attached to him and during the story I get to know that he wasn’t just some random psycho, but there was more in him. That’s also why I’ll miss him.
Sorry for writing so much, I just wanted to explain myself better.

You defenders of Sangwoo're so funny, calm down, there's nothing wrong with loving the villain of a fictional series, on the contrary that's the most common behavior in the entertainment world, this's the opposite of defending a serial killer in real life, so don't feel bad about it ;-).
But you keep trying to justify to yourself why you were fascinated by a serial killer
with wrong conjectures, so I'm sorry I have to disagree with your innocent motives about Sangwoo, and I'm not trying to be arrogant, in fact you made me laugh a little, but I understand you completely.

I am calm, I didn’t mean to be aggressive.. so well, sorry for that.
I’m not feeling bad about liking him, I was just trying to explain myself in a better way, because I know that sometime it is hard to understand.
Well, I’m honest, I’m a bit offended about your laughing about my opinion (I put some effort in writing it and now I’m here like ‘oh man what did I do wrong?’ ╥﹏╥).
I’m not attacking you, it’s a normal reaction and we have clearly different opinions but I’d like to know what’s so funny about my motives.
Could you please explain it to me?

No Sangwoo knows what he does.
The only thing he doesn't know is that he didn't kill his parents, but he's well aware what he does to people. He kidnaps his victims, breaks their legs, undresses them, abuses them(Beats women) and then kills them.

Sangwoo's mom was also clearly fucked up because of her childhood. Is she also not at fault for anything she does later on?

I'm honest too and if I offended you I'm really sorry. It's more like budy talking for me, you know?btw I apologize for laughing. But your speech's the same of others who love Sangwoo for the same reasons you described. You stagnated in admiration for the villain and don't go beyond that...tbt we had long and long discussions about it here so, yes, I get you it's hard to understand.
You do not write badly, I could understand you, that's why I said koogi mess up with your reasons, your motives are confusing.
I'm sorry again.

I think both Bum and Sangwoo actions can be explained by a combination of mental illness, both temporary ( for Bum) as long term ( Sangwoo).
Sangwoo clearly is insane and constantly disturbed by hallucinations about his mother. He is paranoid and completely slave of his own crazy mind. Just assign him culpability for his crimes without taking consideration the effort the author put on explaining how he became like this is just too simple. Would he have done all this if he had allowed to grow up as the normal child he once was within a family environment that took care of him instead of destroying his mind? Probably not. If he could ever be fixed now with treatment nobody can tell but we excuse Bum murdering the girl for temporary insanity and influence of somebody's dominance then we should excuse Sangwoo killings for his around the clock insanity as well and his family influence. Guilt and exculpatory factors should be applied with the same justice for any of the characters, even if one is more likable than others.

buddy*

I agree.

I don’t know why but I can’t read your entire answer. ╮(￣▽￣)╭
Can you repost it below please?

Both are long term.
I also disagree with that statement.
People "excuse" Bum murdering the girl because Sangwoo abused him at that time and kept him like a prisoner and Bum wasn't even aware of what he was doing. He was drooling and kept asking Sangwoo if she would call the cops.
The same can't be said about Sangwoo.
Was he abused when he kidnapped, abused and killed all those people? No. Was he aware? Yes. Was he aware what he did to Bum? Yes. Sangwoo always knows instantly what to do after killing his victims, he mutilates their bodies and then goes to bury them. You can't keep saying "Oh he did this because he was paranoid and had Hallucinations of his Mother" when he did all those things. He mentioned that he sometimes hears her knocking on the door, he never said that he hears her when he abused and killed his victims or abused and raped Bum.

I disagree.

Ok, I understand your opinion but I disagree

Disagree with what?

Well I accept your opinion even if I don’t agree.
Sorry but I don’t understand your question. I don’t know about her childhood, is it something that you guess or is it showed somewhere?
I just asking because I feel like I’m missing something.

Sangwoo said that his mom was severely depressed since her childhood so we're assuming here that something happend to her in her childhood.

Okay don’t worry, I think I understand now.
Thanks for the explanation but I’d like to say one last thing. Actually I don’t really admire Sangwoo, even if I like. It’s more that I feel too damn bad for his situation that I don’t know where to put it.
Oh right and who is buddy? O.O