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

Summary

Lin Xuan, a police officer, discovers a potential kidnapping plot targeting Mu Qing Yan. He seeks the cooperation of the Mu sisters to investigate, disguising himself as their brother. Despite initial skepticism, the sisters believe his warning. Lin Xuan suspects an insider leak in their security team, as the kidnappers seem to have detailed knowledge of the sisters' movements. He carefully observes their surroundings, trying to uncover the method behind the potential kidnapping while maintaining a low profile in the traditional Chinese courtyard house.

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