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

Summary

Summary: Lin Xuan, a National Security agent, encounters a Cossack mercenary investigating the death of a general's son. After a swift confrontation, Lin Xuan negotiates with the general, warning against further mercenary incursions into the Dragon Kingdom. He then returns to the crime scene villa, searching for surveillance equipment related to a complex case involving 13 deaths and one missing person, potentially connected to a mysterious individual named Zhao Qiang and his sister Zhao Bing Lei.

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