I'll put this here again. No one's defending or justifying Mincheol. Back stories are necessary for characters to flesh them out. I'm actually grateful for a back story since the past chapters where incessantly being dragged out with not much story progression. At least now things are progressing since we are given an explanation as to what happened between Mincheol and Heasoo-- it's literally why we have the main couple rn, because the relationship between Haesoo and Mincheol was in tatters at the start of he story, it's a major plot point so we need a backstory.
I'll put this here again. No one's defending or justifying Mincheol. Back stories are necessary for characters to flesh them out. I'm actually grateful for a back story since the past chapters where incessantly being dragged out with not much story progression. At least now things are progressing since we are given an explanation as to what happened between Mincheol and Heasoo-- it's literally why we have the main couple rn, because the relationship between Haesoo and Mincheol was in tatters at the start of he story, it's a major plot point so we need a backstory.