I hope hyesung and him have a fight for the next chapters because what he did is such a betrayal for hyesung. Not only he provided financial support and a home for that mother but also kept in touch with her. I'm on hyesung's side of he crashes out.
Also, let's atleast normalize cutting off toxic parents in this situation bro, his mother doesn't deserve closure, she's just freely living in peace after doing that to hyesung.