This is false. If it had been a woman instead of KJH (especially a Korean girl idol), she'd likely have gotten slaughtered by ifans and Nate/Pann netizens as much if not more. That's the real story that years of Korean and K-pop 'scandals' tell; girl idols got witch hunted even harsher and longer for stuff that boy idols got away with.
As for KJH, or whoever else who would've been in the same situation: yes, it's saddening to be in such a controlling situation and the stress and possible health disorders it caused him is something one can empathize with. But no, it doesn't give him the right nor the excuse to just get away with being an absolute asshole towards others, making their lives even more of a hell than he might be undergoing himself.
1. There were other ways he could've obeyed his gf's demands without acting that horrible on set and towards his acting colleagues (you can keep your distance from others w/o being an ass or making them suffer or cry)
2. The least he could do (and I hope he has done that in private) is offer a sincere apology towards the director and co-lead for the way he behaved
1 is Abit false/misleading because we have the agency to judge because we are not in that situation nor a mentally compromised position at the time plus we have hindsight we can all say well i would have done better or did this/that. Had any of us been in that situation at all you may not have done any of the shit you said you would have done in this situation