Looking for a specific novel

I'm looking for a novel. It's about a young man who ends up waking up on an island with an evil magician/ alchemists. And he wakes up in the body of that person's experiment. The evil guy was trying to get an evil spirit to possess the boy but it didn't work. In the end they boy killed the evil guy and lived on the island alone for 2 years. Then a magician and swords man came and took him away and he became a disciple. 
If you know the novel, thanks in advance
Sorry it's a bad description
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