Under the Black Wind Ridge outside the pass, Ma Ma Nianqing, a younger brother of the Ma family who has been passed down from generation to generation, has been carrying immortal bones since he was a child, but due to an accident, his ability to communicate with the immortal family was sealed. When he was seventeen years old, strange things happened frequently in the village. Children cried in nightmares and tombs were filled with black air. The Xianjia Hall, which had been silent for many years, was forced to reopen. Wong Tai Sin asked a dream to guide the way, and Mr. Huang Santai appeared and gave him a pen. The "Fairy Pen" engraved with runes can not only draw talismans to suppress evil spirits, but also summon immortals and connect the underworld. Holding the pen in hand, Ma Nianqing embarks on the path of her younger brother and horse. While unraveling the mystery of her own seal, she also deals with the ensuing yin and yang catastrophes - a hundred-year-old fox demon seeks revenge, and the golden snake of Changbai Mountain protects its soul... She uses the pen as a blade and the immortal family as a support to work in the cracks of the three worlds of humans, ghosts and immortals.
