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

Summary

The text describes Lin Xuan, a 23-year-old Deputy Department Head in the Public Security Ministry, celebrating his new rank with his team and sister. During a dinner gathering, Liu Yan receives a call about thirteen mysterious deaths across different professions, including police officers, military personnel, and mercenaries. The Special Criminal Investigation Team is mobilized to Mountain City to investigate this perplexing case. Lin Xuan reviews the victims' files, focusing on a mercenary document from national security archives, which suggests a significant and potentially complex incident involving the Cossack Mercenary Group.

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