The story takes place in a fantasy world Baraheim.
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The Regressor: The one who has regressed back to his young body.
(Background: Third Prince of Ulvskar Royal Family of Norrvinter Kingdom)
The Reincarnator: The one who reincarnated in Baraheim from Earth
(Background: Son of a farming couple in the outskirts of Norrvinter Kingdom)
The Returnee: The one who returned from the Murim World to Baraheim, after accidently travelling between worlds.
(Background: Runaway son of Baron Hollwind of Norrvinter Kingdom)
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Summary: