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The female policewoman Ran Dongdong of Xijiang City shot and killed the hostage-hidden criminal in the small supermarket on Miaoqian Street. Although he was praised, he still had a great impact on Ran Dongdong who shot the real person for the first time. When she returned home, her husband Mudafu had some questions about her shooting of the criminal, which aroused Ran Dongdong's disgust. A murder case occurred in Xijiang City . A fisherman found a female corpse by the river. The police team began to investigate the identity of the victim and named the case "Big Cave Case".