
I don't think "he hates the kid". Yes the kid was badly behaved, so he was annoyed, but more important was that he was freaking out over seeing his mother's face on that woman. He might panic and try to run away from the scene, rather than call for help. I think it might be a plot device to show how he reacted with his own mother's death

You are acting as though he was blushing due to being shy, when really his face was red because he was in FEAR and SHOCKED. Stop being a hater and just enjoy the whole plot.
What will our psycho sangwoo do now?? My bet is kill the mom and save the kid...or kill them both....I'm lying i have no idea