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I was wondering what will happen once the MC achieves his goal, this answers my question. His original body doesn't exist anymore, therefore he must embrace being a prince of the enemy nation. Damn that's tough!
But I have a theory that the Secretian Crown Prince still remembers what happened in the original timeline because he was the one who used the artifact. So hopefully, Beren won't be completely forgotten, at least by his older brother. It would be too sad otherwise.