Mother-in-law Jinhua is a Persian Zoroastrianism saint, and she must keep her virginity and not marry according to the canon. She came to the Central Plains to find the lost formula of Persian Zoroastrianism. Unexpectedly, she met Xiao Zhao's father, lost her virginity and got married, which was forbidden by the canon. Once arrested by Persian Zoroastrianism, he would be tortured to death, so he went into hiding in anonymity, but he couldn't hide for a while, so he sent Xiao Zhao into Zoroastrianism to steal the formula of Gankun, and prepared to give it to Persian sects to make up for it. Unexpectedly, Xiao Zhao fell in love with Zhang Wuji, which not only moved Gan Kun to Zhang Wuji's side, but also meant commitment to each other. In order to break Xiao Zhao's idea, he found the formula of Gankun and presented it to the Zoroastrianism altar, only to kill Zhang Wuji.