Picking Up a Villain as a Disciple

The master was the youngest genius in history to break through to the Nascent Soul stage; while out, he picked up a dying little bald boy as a disciple. On the surface, the disciple seemed obedient, but his identity was far from simple, and he had another side unknown to others; only later did the master discover that he was living in a novel world, and that the obedient disciple he had raised was actually the future world-destroying ultimate villain.