So I had like 0 expectations and I didn't want to study for the exam so here I am.
I thought it was going to be like a fairy tail but the guy is actually quite shady. It's not the plotwist of the century but it was nice.
Probably they both were involved in some kind of accident, which made the girl lose her memories because of the trauma and the boy to be messed up and far away for some years. Since the girl's dad hasn't appeared at all it could be something related to the parents of both kids, though it's just an idea.