The Master of Charms at Hogwarts

Ten years ago, he was imprisoned in Azkaban because of being framed. Ten years later, Oliver traveled back in time and discovered that he was actually the uncle of the savior Harry Potter? Confused, helpless. Fortunately, Dumbledore came to his aid and cleared Oliver's name. He was also invited to serve as an assistant professor in the Defense Against the Dark Arts class at Hogwarts. In this cursed course, the assistant professor should be able to get away with it, right? What's the best defense against black magic? That is to play out the magic spell! Until many years later. When the mysterious man returns, he finds that everything has changed in the wizarding world. Is this a curse? No, this is an illusion!