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

Summary

Police officers Guan Feng and Huang Li Li investigate a nail salon regarding a criminal case. They discover a victim's unique sickle-patterned nail design matches a previous customer's manicure. The nail technician, Qian Qian, recalls doing the design and takes photos of the customer's hands. Guan Feng confirms the nail details match the victim and obtains the original images as evidence. He warns the salon staff to maintain confidentiality about the ongoing investigation to prevent the suspect from potentially fleeing.

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