Harry Potter Is Not the Professor's Son!

Uh, first, let's talk about the plot. A man, a super-assassin who lived from one killing contract to the next, waiting to die, transmigrates! And in the most clichéd way imaginable, the kind that doesn't even inspire a snarky comment: his soul transmigrates into another body. The poor child, possessed by our protagonist as a baby... no, not possessed, but body-snatched, also has a whole lot of something-or-other about him that makes people feel they should stay away, like an evil spirit? [garbled text in source] Then our protagonist has a tragic time of it! Quick, quick, make a plan: Hogwarts and all that, keep it far away; learning magic and all that, put it on the agenda; finding Daddy and all that, don't even think about it! Killing people, making money, and falling in love are the way to go! But is that even possible? Young man, get moving! You're destined to become a Lord of the Gods! The protagonist's golden finger is ridiculously powerful. He's basically invincible early on, and completely invincible later. If that's not your thing, don't read. No bashing Gryffindor or Slytherin. As for the pairing, it should be the professor.