The humid southern town "Moss Town" is shrouded in fog all year round. The legend of the "Yin Boy" passed down orally by the townspeople hides a centuries-old bloody taboo. Lin Shen, a folklorist and self-media blogger, went here to investigate the case of his sister's disappearance, only to find that serial murders and weird folk customs intertwined into a fatal trap: a corpse in red knelt down before the church, had hexagrams carved on its tongue, and its heart was replaced with a clay sculpture. However, her sister's relics actually appeared in the hands of the deceased ten years later.
As the investigation deepened, Lin Shen uncovered the cycle of sacrifices in the Year of Jiazi - burial alive to pray for rain in 1932, hanging of a theater troupe in 1984, and modern organ trafficking. All tragedies were whitewashed by the legend of "Yin Boy". He was forced to face the bloody truth: he was actually a sacrifice that should have died young, and his sister had tampered with his memory in exchange for her life. Behind the scenes, the mayor and the priest and his son were actually selling organs in the name of ghosts and gods, and even used hallucinogenic fungi and machine puppets to fake supernatural phenomena.
The collision of folklore details and quantum physics, the confrontation between live barrage and traditional Nuo opera, reach a climax in the final chapter when the heavy rain washes away the mass graves. When Lin Shen used a drone to spread incense and ashes to break the formation and left with his sister's ashes, the figure of the child in red in the rearview mirror hinted at a deeper horror - the legend nourished by collective sin may be a curse to live.
