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The ancient mythical beast Kui Niu came down from the mountain to overcome the tribulation, accidentally breaking the thousand-year misunderstanding between heaven and demons. In the process of finding out the truth, he got acquainted with six brothers from the demon world and resolved their old grudges with sincerity, leading to a reconciliation between the demons. Faced with the encirclement and suppression by the heavenly generals, Kui Niu led his brothers to heaven to clarify right and wrong. In the end, he won the respect of heaven with his virtue and was named the "Great Sage of Pingtian", safeguarding the peace of the three realms.