@Moa moa Why would you feel guilty for hating him? He may have been a decent person in the past, but it doesn't excuse his behaviour now. They went through some heavy sh** together, but Kang Mincheol put all the burden on Na Haesoo. He poured all his insecurities on her, nitpicked every single detail, mentally tormented her because he found relief in the thought that there is someone more miserable than him; that no matter how tough and humiliating the life is outside, at least at home he is better, at least at home there is a person to tend to him no matter what. Present Kang Mincheol is the result of wrong decisions of the past one. Author didn't show this to us to find excuses for Mincheol; they did this to explain why Na Haesoo let him treat her in that way. That she is not stupid, pathetic and delusional, as someone wrote in comments of previous chapters, she had her reasons.