I've already become a Hogwarts professor, and the system only just appeared.

Over a decade ago, Su Yu fled the clutches of the Death Eaters, leaving England behind for the relative safety of the United States. There, his prodigious talent for alchemy quickly earned him a formidable reputation, allowing him to carve out a quiet, unassuming life far from the wizarding world's constant peril. He had long since accepted that his future held nothing more than the steady work of a craftsman, a peaceful existence spent brewing solutions and enchanting objects, far removed from the chaos of his past. That tranquil life is violently upended, however, by the arrival of a single, unexpected letter—a formal offer of employment from Hogwarts School of Witchcraft and Wizardry. The parchment shatters his carefully constructed sanctuary, dragging him back into a world he had desperately tried to escape. Yet, the shock of the invitation is compounded by an even stranger occurrence: a mystical system, appearing in his mind alongside the letter, insists on a bizarre and unsettling misreading. It refuses to acknowledge the document as a job offer, instead claiming it to be a student acceptance letter. Su Yu is left to grapple with a perplexing mystery—why does this new power see him not as a professor, but as a student returning to the very school that represents the dangers he fled?