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

Summary

Wang Xun and Liu Sheng Guo continue their investigation after a meal, while Guan Feng takes Huang Li Li to a busier commercial area. At a supermarket, Guan Feng reviews surveillance footage and discovers Professor Guo Xiao Dong, raising suspicions about his presence. They enlist Li Xiang Dong to retrieve footage, but find that someone is evading cameras. Guan Feng uses a search function to locate another camera, leading them to a resident's house where they retrieve crucial footage. The video reveals Guo Xiao Dong arriving alone before Wang Jian appears, suggesting a link to a previous argument. Speculations arise regarding Wang Jian's possible motives for violence.

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