Ten years ago, Zhao Pengcheng, a police officer from Pinghai Station Police Station, encountered a suspect with a gun while on duty. He fired a "dumb" shot. At the critical moment, his master Xu Lei stood in front of him and shot the criminal to death, but was also shot and disabled. This put Zhao Pengcheng under heavy mental pressure at home and at work. Ten years later, a "misfire" accident occurred in the duty room of Pinghai Station. The police officer Liu Changlu decided to conceal the matter for the sake of others' future, but Zhao Pengcheng, who witnessed the "misfire", was deeply trapped in the choice between emotion and reason. The "misfire" incident was reported by someone, triggering interpersonal disputes in Pinghai Station. During the investigation, Zhao Pengcheng and Liu Changlu were attacked by police. When Liu Changlu fired a warning shot, a bullet accidentally injured a passerby, causing an accidental "fire", and was brought to court. The case triggered legal thinking on the use of guns by the police. Lawyers Chi Yu and Zhao Pengcheng found key evidence to clear Liu Changlu's charges. Zhao Pengcheng admitted to Liu Changlu that he reported the "misfire", but was misunderstood by everyone. When facing the gun again, Zhao Pengcheng stood in front of Liu Changlu and killed the criminal in seconds. Zhao Pengcheng's "firing" broke the spiritual shackles of the "dumb fire" that year, and made everyone understand the correct meaning of his reporting of the "accidental discharge".