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

Summary

In the early morning, the city awakens with bustling food stalls and tired undercover detectives struggling with their case. Lin Xuan reflects on the challenges of police work, including low marriage rates among officers. Conversations among team members reveal insights into two former college friends, Zheng Yu Tong and Wu Xiao Hui, who may have been involved in a dangerous lifestyle, including possible prostitution. Clues suggest they interacted with wealthy individuals, leading to suspicions about their past. The investigation intensifies as Lin Xuan and his team aim to uncover the truth by connecting with others from their college days, searching for potential suspects linked to their troubling circumstances.

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