The old town of Cangcheng hides the evil spirits that have not disappeared for thousands of years. Mass graves, ancient villages, and abandoned haunted houses are everywhere. Under the modern prosperity, the gap between yin and yang has already been undercurrent. Chen Yan, a boy from a paper-making shop, unblocked his dark eyes after his grandfather passed away, and saw with his own eyes the ghosts wandering around the city: hanged ghosts combing their hair in the middle of the night, ghosts punching walls in the subway cycle, water ghosts seeking their lives by the lake, vicious ghosts that eat people's lives, lingering infant spirits... Those folk taboos passed down by the elderly from generation to generation are never superstitions, but the bottom line for living people to save their lives.
The truth behind the mysterious and tragic death of his parents, the restless yin veins in the demolition area, and the strange serial death cases drag him into a thousand-year secret. He inherited the secret skills of walking away from the dead and paper-tying, and teamed up with the goddess, the undertaker, the Feng Shui master and the policewoman Su Qingyuan from the crime team to become the last night watchman in the city.
However, the "poor customs" who specialize in destroying folk customs, digging graves and breaking prohibitions are secretly causing chaos. Dark marriages, longevity extensions, raising ghosts, and bone stealing are rampant, and the seals of the Yin veins are broken one after another. The headless city god's resentment appears in the world, the evil soldiers take advantage of the way, the five families are in chaos, hundreds of ghosts walk at night, and the entire city of Cang is on the verge of becoming a ghostland.
Chen Yan uses paper to lure souls, uses charms to suppress evil spirits, and uses ghosts to connect the underworld. He is not only guarding an old shop, but also the last line of defense between the human world and the underworld. He will eventually understand: The most vicious thing in the world is never ghosts, but the ones who destroy the reverent people and keep the old ones.
