Solving the Case is Slightly Bitter, My Sister is Super Sweet.

Summary

In 2021, a forensic expert invented the 'Footprint Revelation Agent,' designed to reveal hidden footprints even when shoe covers were worn. Despite appearing to leave no trace, human activity introduces dust and particles into spaces, which can be detected with this agent. Lin Xuan, a trainee cop, impresses his master, Zhao Qiang, by demonstrating the agent he claims to have developed at police school. The agent effectively reveals footprints by reacting with surrounding debris, causing bubbles that outline the imprints. Excited by the discovery, the team is soon confronted with the challenge of using it at a crucial crime scene, where higher-ups must approve its application.

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