Changing my Fate from DarkHero to Genius Spirit Wielder of Archduchy

A college student dozed off in the middle of his lecture and found himself transported RPG as the six year old Ronald Hartstrong, who was happened to be a descendant of spirit wielder family. But according to the original story the problem is Ronald currently being held as a test subject by Dr. Dravan, a crazy-genius. And if eveything goes as it supposed to, Dr. Dravan would soon succeed in his quest by making Ronald a living killing machine. then years later Roland would gain his senses and became the dark-hero and die without anyone ever knowing what he has done. Such is the fate of a darkhero. So the only way to escape that fate Roland has to find a way back to his family without getting his mind taken away. But it's not as easy as it sounds when the kidnapper happens to be obsessed with his pure mana.