Transmigrated in HP as an Orphan!

Alex Von Tempest, a ruthless, lustful, selfish, and ambitious businessman, died in a plane crash at age 21. He transmogrified into the (slightly AU) world of Harry Potter in 1989 in the body of an abandoned 10-year-old boy, but he didn't know he was in the fictional world of HP, because Harry Potter novels/movies didn't exist in his previous world!
Let's see how he survives in this world!
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My English is not that good, so don't expect much from me!