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

Summary

The story revolves around a complex strategic game involving mercenaries and a mysterious killer. A group of 15 Cossack mercenaries enters a mountain city, seemingly to distract authorities. Lin Xuan, the protagonist, believes this is a misdirection tactic, with the real target being the Cossack Mercenary Group's leader, Chu Pu Li Na. The mercenaries stage a bank robbery to draw attention, while Lin Xuan investigates a murder case. Later, he discovers six elite mercenaries killed in an abandoned factory, suggesting the involvement of an exceptional combat soldier who has kidnapped Chu Pu Li Na. Lin Xuan is determined to track down this mysterious killer.

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