I, King of Criminal Investigation, Solving the Rainy Night Serial Murders from the Beginning.

Summary

Summary of the text: A police officer, Guan Feng, recruits Chen Yao as an informant (or "fox") after solving a case involving organ trafficking. Chen Yao, previously a small-time troublemaker, is excited about the opportunity to prove himself. Guan Feng sees potential in Chen Yao's street smarts and believes offering him recognition and a sense of purpose will make him a loyal informant. The recruitment involves a signed confidential agreement and the promise of some criminal immunity for specific investigative tasks.

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