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PLEASE DON’T SPOIL ME ANYTHING THIS IS JUST A THEORY
Ok so I think the older brother was constantly being sexually assaulted by their father, and when the father tried to come onto the younger brother, the older brother did it “willingly” so the younger brother would be spared. Now when Minjae arrived at the house, the older brother might’ve felt with the authority to send Minjae instead of himself to defend the younger brother and then be nice to Minjae being empathetic and maybe even tried to sexually assault him and shit but Minjae had none of it and hit him.