A Si, the green cow under the throne of the Supreme Lord, was unjustly demoted to the mortal world. He established a Taoist tradition in Jindou Mountain to protect the common people, but was framed by the black hands behind the scenes, leading Sun Wukong and the Heavenly Court to attack him. While breaking the situation and proving himself, he traced the truth, and finally tore up the conspiracy in troubled times, avenged the injustice, and established a new order where the three realms respect each other.