Juding from one of the chapters which showed Sangwoo's memories, it showed that the father also mistreated his wife by making her sit on the floor to eat. What I think is that Sangwoo must have done those things to his mom because she took the father's side more than her child. Ofcourse he would have been fed up with her behaviour of always taking the father's side, so he must have tried to drown her. (Well that's only what I think must have happened)
You might be right, but I actually believe he is re-enacting his mother more than his father. Reason being chapter 27, and chapter 21 and I think 22
Sangwoo...u are ur father. You're worse than him. Sure he was abusive, but to the best of our knowledge he never killed anyone...
I know this isn't the most popular opinion but I can't forgive or feel pity towards Sangwoo. He's never earned it in my eyes