I’m calling it now. They aren’t going to end up together but hopefully they find support from others in their lives at the end of their story. The idol chick needs legit therapy and maybe she’ll get in touch with a trusted family member so she can live a more relatively normal life. And the main dude will hopefully salvage some type of civil relationship with his dad and move on since he has best friends who will love and support him.
On real life, the chance of salvaging the relationship with his father would be miniscule. Hell, given the way the dad is being painted, why would anyone want to remain in contact with a parent who doesn't do the bare minimum AND hits their adolescent son? It would be too much of a leap of logic if somehow the father had a sudden change of heart after all that and now wants to be a "good dad", or for MC to forgive many years of poor treatment and trauma, specially on the short term. Some people like to harp about "oh, but they're family!", but being blood-related means a lot less than truly caring for someone.
IMO best solution is for MC to get emancipated and receive a pension (or maybe work part if a pension is not a viable option) and go live by himself. Maybe after a decade or so of living separately they could start mending their relationship.