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maybe, the mother is jealous of sangwoo because her husband seems to love sangwoo the most more than her. so she tried to makes sangwoo hate his father with lying she was abused by his husband. when she said sangwoo was sorry for her is because she brainwashing sangwoo that his father abused her and sangwoo feels sorry to her. and when she told sangwoo that she love her husband and makes sangwoo came down to the first floor is just for sangwoo to see that her husband loves her much than he did to sangwoo. and i think sangwoo himself know that he hated by his mother and his mother lied
just my opinion, maybe its wrong. idk, its so confusing.
The meme omg