Lü Dongbin, one of the Eight Immortals, acted without authorization during a battle with the Demon Lord Hunyuan, which indirectly led to the death of He Xiangu. He was demoted to the mortal world and met Bai Ying, the village chief who looked like He Xiangu but had a completely different personality. In order to save the fairy, Lü Dongbin, Bai Ying and the magical dog Zi Ao embarked on a dangerous journey to the east...