On the first day after graduating from the police academy, Lu Yan came across an unsolved case of mutilated corpses. No one knows that after falling asleep every night, he will enter a 100% replica of the crime scene, where he can die, start over, and deduce unlimited times. While others relied on experience to solve crimes, he relied on his dreams and died thousands of times. Every time he solves a case, he gains one more criminal investigation skill. But he slowly discovered that all the unsolved cases in the dream pointed to the same person.
