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

Summary

Summary: Lin Xuan receives a mysterious late-night call from the National Security Department's Second Bureau, requesting his assistance in finding a specific person and item. Driven by his grandfather's implied involvement, he is taken to their headquarters, where the bureau director, Shen Yong Jun, carefully approaches the sensitive mission. Despite initial communication challenges, Lin Xuan realizes he has little choice but to participate, intrigued by the classified nature of the request and the potential international implications.

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