I liked this drama despite the issues, spolier alert!
The ML has paranoia and anxiety due to his upbringing and he lashes out at the FL lead whenever she's with her ex. At the beginning it's kinda cute that he's prptective and jealous, but then it quickly turns violent, and then escalates some more. Honestly I've been in similar situations as the FL and wanting the man you love to change while you're with them is impossible. The best thing they could have done was split up and try to work through their issues separately. I do like that the drama made it clear the ML had serious issues and needed therapy. I don’t think that's mentioned enough in any dramas especially since in a lot of them the MLs are overbearing, jealous and quick to fight and get angry. I would say this is a good warning to girls who like this type of obsessive ML. It may be ok in dramas but it's straight up toxic in real life and this drama portrayed that well. I went in thinking it would be a cute romance but instead there was a lot of really complex emotions and it explored the damage bad parenting can cause. If you're not put off by some violence and depictions of physical abuse, definitely watch.