Xavier was born royal, having the pure blood of Moroi's coursing through his veins from the day he graced the earth. However, his fate was harsh. When he was barely a year old, his father was turned against his will, and it was only because of his mother's sacrificial love that he is still breathing today. Alive, yet hardly so. Robbed of both parental existence and love in his life, he was taken in by his aunt, though it seemed his poor condition did not soften the treatment she gave him. Cold and uncaring. It could be worse, he often thought to himself. He could be scrubbing the walls like their servants and deprived of the required nourishments, he consoled his lonely 5-year-old self. 

After graduating from St. Vladimir, Seokjin chose to teach there. He couldn't imagine himself doing anything else ( or nothing at all, much like other royal members of their family ), and fortunately for him, his aunt merely responded to his request with a nonchalant wave of her delicate hand. To be honest, he was beyond relieved he didn't have to fight for the chance. He couldn't have been able to change his aunt's mind once it was set. So now, here he is, living in the staff's quarters and teaching Advanced Water Manipulation at the same school he'd studied in.