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Will is a genius detective who is haunted by nightmares because he killed a serial murderer ten years ago. Before his death, his colleague Ross told Will that the murderer from ten years ago had turned into a ghost and began to exact revenge. Will's investigation found that the murderer could kill people through dreams, and the nightmare that Ross was haunted before his death was exactly the same as his own. Is this an elaborate hoax or is there a real ghost? Can Will escape the fate of being executed and catch the ghost? But during the step-by-step investigation, another shocking truth was discovered, and Will stepped into the abyss.