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

Summary

The passage details an investigation into a food poisoning incident involving cattle meat. Zhang Yong Sheng, a shop owner, was initially suspected of selling poisoned beef. Through surveillance footage, Guan Feng discovered that Zhang Yong Qiang, Yong Sheng's distant cousin, sold him intentionally contaminated cattle. The investigation revealed Zhang Yong Sheng's innocence, showing he was unaware of the meat's toxicity and attempted to sell it honestly. However, the incident still resulted in over 100 people being poisoned, with potential legal consequences for Yong Sheng.

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