Maybe the white haired guy abandoned his (Fl's) brother because fl's brother abandoned them? It looks like the prince is very filial... (I don't know just a guess.)
I just woke up and I re-read this 3× but I still don't understand what u mean by this lol
Well the ML has been fan boying to the FL since she was always taking responsibility and taking care of her father...
Maybe the white haired guy abandoned his (Fl's) brother because fl's brother abandoned them? It looks like the prince is very filial... (I don't know just a guess.)