If this were real life and not a drama, BOTH ML and FL would be in a mental health facility!
The FL obviously enjoys being physically and mentally abused - that really is a mental disorder, research it and you will find the FL depicted in the symptoms. The more he hurts her, the more she loves him. Ever wondered, why she does not just walk away, why she NEVER, not even ONCE sets any kind of boundaries at least to the physical abuse? Yeah, that is one of the symptoms of the mental disorder. I can´t even count how often he mistreats her - but at least once every single episode.
The ML obviously has a huge childhood trauma which results in excessive abusive behavior towards the FL and her sick mother. This goes on to the extreme, again and again and again.

If this were a drama about describing and depicting mental health problems , it would be really good because the writer really managed to bring those mental disorders to a refined dot on the i and this drama would get 10 stars from me.

This is NOT a romance, this is the TOXIC interaction between two mentally unstable people and this romatization of violence and abuse should finally STOP.