Ep. 25: Yoh revela que Hao es su hermano gemelo, sorprendiendo a amigos y padres

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Yoh confesses that Hao is not only his predecessor but also his twin brother. This shocks most of his friends while his parents remember how they failed to kill the recently born Hao. Yoh's grandfather trained him in order to have him defeat his twin in the future. (Source: Wikipedia)