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

Summary

Police detective Guan Feng successfully traced Zhang Yong Qiang's involvement in a poisoning case by identifying his footprints in Zhang Hua Feng's cowshed. During interrogation, Zhang confessed to deliberately poisoning the area to seek revenge and recover gambling losses. He instigated Zhang Qing Shu to eliminate guard dogs and then personally poisoned the location, hoping to cause minor disruptions. His plan backfired when over 100 people were affected, leading to his arrest. Surveillance footage and his own testimony ultimately exposed his calculated scheme to create problems for Zhang Hua Feng.

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