Responses
So he wasn't like that before but he became like that because the mother was cheating on him? Okay, but why did he have to hurt Sangwoo as well? He literally had no fault :(
And why did the mother even cheat in the first place if the father was a nice fellow? She actually ruined the whole family, god damn her (╬ ̄皿 ̄)凸

Before I thought the father was the psycho but now it turns out it was the mother? The father looked pretty normal throughout this chapter. So why was he portrayed as an abusive alcoholic who beat them before? I may be missing out something.