Okay so I'm gonna explain this from my point of view ig. The mom was just mentally not prepared and wasn't ready so she tried smother sang woo which lead to the father abusing them and how he became a pr***. Before all this she ended up cheating and Singapore witnessed or heard her cheating. That ended up giving him some sort of PTSD which lead to his mental disorders. The reason why he's done so much fuc*** up sh** is because of his trauma and what his family did. I'm not saying we should like sang woo more but at least cut him some slack