Pang Yan, a down-and-out private detective, was accidentally involved in a bizarre serial murder when he took over an ordinary disappearance case. The victims died in twisted ways, and a blood-stained playing card was left at the scene. All the cases perfectly corresponded to the ancient ghost stories circulating in the city - the legend of the Red Moon. Just as he was trying to sort out the clues, a car accident sent him into another world: a seemingly modern parallel time and space where ghosts were rampant and strange stories came true. He traveled through time and became the detective of the same name who had just died on the night of the red moon. His own death countdown suddenly appeared on his notebook - there were only seven days left until the next red moon rose.
