Li Rui, a former detective wearing electronic shackles, discovered a copycat crime that was exactly the same as the one used to frame him while patrolling the community. The real culprit is at large and the police are helpless. He dragged the shackles and chased the murderer alone, and finally blocked the murderer in a dead end - the other party smiled grimly: "Officer Li, I salute you." The unjust case was cleared, but the police uniform could never be put back on. The provincial department transferred him to the newly established "Difficult Case Review Office" as a section-level director, specializing in handling tough cases that the police force did not dare to investigate. From the crime-ridden body to the sharp sword hanging within the system, his sentence was reduced entirely by solving the case.
