Niu Ergui, tempted by a demon, stole the fairy's magical artifact, the Feather Garment. Knowing this was her mortal tribulation and wanting to find out what mischief the demon behind it was up to, she played along and went home with this mortal, but unexpectedly fell into the wicked scheme of the Taoist demon and was trapped within the formation. In a desperate situation, Niu Ergui embraced the conviction of certain death to break the formation and help the fairy regain her freedom, ultimately moving her. The fairy granted him a new lease on life, turning him into a truly affectionate and righteous man, and from then on he always followed the fairy to serve her faithfully!