Responses
My memory is a bit hazy but if I remember correctly, he has a stepmother whom he's not close with. His father insists to call her mother which makes Haneul very uncomfortable. He also seems to dislike his father. We didn't really get much information about his family.
(If I'm wrong someone correct me pls)

uhmm i kind of forgot the plot of haneul's family. what's going on? does he hate his mother? is his mother not his biological mother? or is his father not the biological one? I FORGOT! someone tell me