@Kim Rok Soo That's because in reality, there has always been a gap between the nobility and the commoners, let alone royalty and commoners. Royalty think they are Gods. And to them, commoners are just puppets who do what they are told.
@DietPepsi then he doesn't deserve to be a king. The nobles and common people are the subjects of the royal family and they have the duty to serve the kingdom, but it's the same about the royals. They are there to rule and protect the people, so they have to serve them as well. As Peter Parker said, "with power comes great responsibility".