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

Summary

Lin Xuan and his team investigate a complex murder case potentially linked to Zhao Qiang's revenge for his sister Zhao Bing Lei's disappearance. They suspect the killer's elaborate scheme is designed to attract the Cossack Mercenaries into Dragon Kingdom, a strategic location with strict military control. The team theorizes that Zhao Qiang might have spent two years developing extraordinary combat skills to potentially eliminate the entire mercenary corps, transforming from a mathematical genius into a potentially formidable strategic threat.

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