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

Summary

Lin Xuan investigates a surveillance operation involving a mysterious underworld figure named He Qiang, who has been paying a lackey to monitor an old man and a girl for over a year. After interrogating the surveillance operative, Lin Xuan obtains information about He Qiang, a 39-year-old criminal known for having subordinates take the fall for his illegal activities. With a reputation for generosity in the criminal world, He Qiang operates in J City's underworld, frequenting a nightclub filled with his armed lackeys. Lin Xuan decides to confront He Qiang directly, entering the nightclub to uncover the truth behind the mysterious surveillance.

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