How Can You Become a Great Emperor by Accepting Trash as a Disciple?

A frail physical education teacher traveled across the Tianxuan Continent and wondered why it was so difficult to teach a useless disciple! The one-armed beggar of the first disciple finally became a one-armed swordsman? The second disciple was tone-deaf and finally achieved enlightenment by playing rock music? The third disciple, recognized by the whole town as a fool, turned out to be a "conceptual god" in the end? Is there any justice left! ! !