I don't get the people who say they're not fit to be together due to their different positions, like, isnt mc the son of someone pretty important? Like, i can't remember the exact social structure (and with titles being in korean), so correct me if i'm wrong, but it seems like his family is basically on the level of a duke/one of the top clans, or something like that (and his dad seemed to have some sort of friendship with the emperor? Hence the princess visiting on his birthday), and a marriage between a princess (even a high ranking one) and the heir of a dukedom is pretty common. It's not like royalty can only marry royalty.