At the foot of Heifeng Ridge beyond the pass, Ma Nianqing is the hereditary spirit medium of the Ma family. Born with an immortal bone, she lost her ability to communicate with the immortals after an upheaval sealed it away. When she turned seventeen, strange events began happening throughout the village: children cried out in their nightmares, and black mist spread over the graves. The spirit hall, dormant for many years, was forced to reopen. The Yellow Immortal guided her in a dream, and Third Grandpa Huang appeared to give her a brush. Covered in talismans, this “immortal brush” could draw charms to suppress evil and summon immortals to commune with the underworld. Gripping the brush, Ma Nianqing embarked on the path of a spirit medium. As she unraveled the mystery of her own seal, she faced one supernatural calamity after another: a century-old fox demon seeking revenge, a golden snake from Changbai Mountain protecting a soul... Using her brush as a blade and the immortals as her allies, she navigated the narrow space between the realms of humans, ghosts, and immortals, uncovering a century-old secret history of the Northeast's immortals. And as she warded off evil and overcame calamities, she discovered the purpose and destiny of a spirit medium.