Dating a single parent isn’t easy. You’re entering in a relationship with both the parent and the child(ren). The latter may reject you and not think of you as their parent or you might get along but they tell you that you can’t replace their biological one. Sometimes they may have accepted you but say something hurtful in a fit. You’ll also have to tolerate the ex partner and ensure that they still have a proper relationship with their child(ren) too. Some of them may be terrible and you might have to put up with fights between your partner and the ex. If they’re dead then you’ll have to live up to them while also avoiding to erase their existence from the child(ren)’s heart. You also have to give them as much love and attention as you’d give to your biological children. It’s a lot responsibility and demands a high level of maturity and kindness. In reality, an inexperienced person like the MC shouldn’t even attempt it. Here though, we’re dealing with a work of fantasy and it isn’t meant to be realistic.