Ou Ken's immortality is immortality in the true sense, not simple longevity. No matter what kind of injury he suffered, he could recover instantly, so he was also called the nemesis of Poggi by Despa. Ou Ken, one of the three brothers in hades, and Ou Ken, who used to be a perfect knight, could hardly find their own shortcomings. Such a person eventually loses himself because of his longevity, which is a reflection of "what goes around comes around comes around", but the story of the ranking of kings has not stopped persecuting this role. Ou Ken, who lost his mind, was initially locked up by his brother.