Right now, my dream scenario would be mugi realizing her self worth, objectively seeing that she is worth more than just breadcrumbs of attention, dumping his ass and living her best life until she encounters someone who is actually appreciating her.
Then comes his chasing arc and if not, years will pass and he will realize what he lost and sing the song ´the one that got away´ lol
You can say what you want about the story itself, but how our sociopath is portrayed, his feelings, and also the scenery that is created, is amazing.