Not him tryna justify his abusive ass

he isn't. he's just opening up to inseob because he thinks inseob should know lol wooyeon noticed how inseob is getting tired of his abusive ass so he tried to salavage it by confessing the truth. it can be gaslighting but he isn't justifying it, he is just explaining how he knows he's a bitch but at the same time he couldn't control it either because that's his nature.