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

Summary

The summary reveals a complex investigation involving Cheng Gao Ang, a suspect linked to mysterious virus-related murders. Lin Xuan, the investigator, discovers suspicious connections between Cheng Gao Ang and his mentor Wang Liang Xu, a virology professor who disappeared. After intense analysis, Lin Xuan suspects Cheng Gao Ang might be controlled by an unknown entity and could potentially be trying to prevent a larger viral catastrophe by strategically killing specific targets. A mysterious woman was spotted monitoring Cheng Gao Ang's movements, further complicating the investigation.

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