After graduating from college, Chen Yu returns to the remote, isolated village of Yin Crow to fulfill his grandfather's last wish and inherit his role as the village night watchman. Yin Crow is full of folk taboos: never call anyone's name in the dead of night, never accept a red cord at the third watch, never tie a rope around the old locust tree at the village entrance, and never set foot in the mass grave on the back hill.
His grandfather's night watchman's journal is filled with a century's worth of unsolved paranormal cases. As soon as Chen Yu arrives, he encounters one terrifying incident after another: a ghost marriage demanding a life, a water ghost dragging people away, a paper figure returning to life, and a vengeful spirit haunting an ancient well. Born with yin-yang eyes, he can see wandering spirits and hear the lingering obsessions of the dead. As the night watchman, he has no choice but to face every evil presence in the village.
As he solves one supernatural case after another, the secret behind Yin Crow gradually comes to light: it was once an ancient site for sacrificial rites to Heaven, and the resentful spirits of a hundred ghosts have been building up behind their seal for centuries, ready to break free at any moment. The night watchman clan is the last line of defense holding back the evil. Overcoming his initial terror and panic, Chen Yu slowly masters the yin-yang arts and folk exorcism techniques his grandfather left behind. He resolves the village's strange incidents, investigates the true cause of his grandfather's death, and fights the practitioners of dark arts who covet the power of the yin grounds.
From the strange happenings in Yin Crow to the secrets of nearby haunted towns, ancient temples, mass graves, and abandoned charity burial grounds, then to curses and conspiracies spanning generations, Chen Yu steps ever deeper into the mysteries of yin and yang. He guards more than the village through the night: he protects the boundary between the human world and the underworld. With ghosts roaming by night and evil spirits running rampant, he takes on the role of ferryman between yin and yang in a mortal body, ultimately becoming the supreme night watchman whom all ghosts fear.
