Chen Yu, who graduated from college, returned to the remote and isolated Black Crow Village in order to fulfill his grandfather's last wish and inherit the identity of the night watchman left by his grandfather. There are countless folk taboos hidden in Yinya Village: do not call people by their names in the middle of the night, do not tie the red rope at midnight, do not tie the rope to the old locust tree at the entrance of the village, and do not set foot in the mass graves in the back mountain.
The night watchman's notes left behind by his grandfather are full of strange things in the village that have not been solved for hundreds of years. As soon as Chen Yu entered the village, he encountered horrible and strange things one after another such as the murderous marriage, the water ghost pulling people, the ghost of paper man, and the resentful ghost in the ancient well. He was born with yin and yang eyes, which allowed him to see wandering ghosts and hear the lingering obsessions of the dead. As a night watchman, he had to face all the evil spirits in the village.
As one supernatural incident after another is solved, the secrets behind Yin Crow Village gradually come to light: it was once the ancient underworld, where the sealed resentments of hundreds of ghosts have accumulated for hundreds of years and will break out at any time. The night watchman family is the last line of defense to suppress the evil. From the initial fear and panic, Chen Yu gradually mastered the secrets of yin and yang left by his grandfather and the folk exorcism methods. While solving strange things in the village, he also traced the real cause of his grandfather's death and fought against the evil people who coveted the power of the yin.
From the strange happenings in Yinya Village, to the secrets of surrounding Yin Towns, ancient temples, mass graves, and abandoned yizhuangs, to the curses and conspiracies that spanned generations, Chen Yu stepped into a deeper mystery of Yin and Yang step by step. He guarded not only the night of the village, but also the boundary between the human world and the Yin Cao. Hundreds of ghosts walked at night and evil spirits abounded. In his mortal body, he acted as a ferryman between Yin and Yang, and finally became the ultimate night watchman to keep all ghosts away.
