Responses

I also read the raws and it’s true that the red head can’t go into detail but he does tell him that he didn’t want to do that with anybody to which Siwoo believes. And wrong Siwoo is abusive towards people who are abusive to him. So he hits whoever hits him. In the latest raw he kept asking if the red head was ok, even held his hands. But during their intercourse, the red head kept insisting on continuing the sex and when he was having hard time. I understand bits of Korean.
Spoiler
Siwoo hasn't realized it yet, in the next future chapters, Do-hyeok can't tell siwoo about what happened even if he was asked by siwoo, his pride ate him. And I now see Siwoo true colors, he is very abusive in future chapters