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The great hero of the past fell off a cliff and died, possessing the body of a recently deceased child. But because he was seriously injured but still alive, he was considered by everyone to be a devil. As time went by, he decided to become what everyone thought of him. Tens of thousands of years later, he had a new name - Black Peter, but when he was about to become the Emperor of the Demon Realm, he met a person who had died, a person who had been dead for tens of thousands of years...