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On a night of thunderstorms, the old man guarding the cemetery died mysteriously in the guard room. This death was the sixth in the past five months. The death of the old man once again caused a sensation in the local area. The city criminal investigation team once again received a mysterious report. It was later found that the reporter was a man with a mental disorder. Why did he appear? The police began to investigate one by one. Strangely, people who knew certain details of the case disappeared and died again. The case is in trouble. Based on the analysis of the case, the police arranged for Lu Yun to find an opportunity to infiltrate an unknown criminal group in the bar. From then on, Lu Yun embarked on a thrilling and long undercover career...