The Royal Academy of magic had always held a reputation of the best magical school on East Islands, which is why the only students who had ever had the privilege of enrolling were the realeses (upper class of east islands magical society) and the seven royal families, whose children had been receiving 1/4 of their required education on The academy for almost a century. Their identities were highly protected and because of the well known fact that everyone who had ever learned them simply disappeared, people weren't particularly enthusiastic about trying to find them. 

Do Kyungsoo wasn't a royal, no, he was actually as far from the royal as someone can possibly be. He belonged into non-magical part of east islands population that had no rights (ordinariums), no publicly recognized names and no freedom. He was nothing but a number in the system, a slave that could be bought and sold and had no choice but to follow his owner's will. But there was something that separated him from other ordinariums - the magic he definitely did have and the strange symbol on his left wrist...