一次意外，战友为保护龙战不幸牺牲，龙战也因指挥失误被提前停职退役，带着战友的临终遗言来到了其家乡云南边境做起了邮差，此时的金三角毒品交易不断扩张入境，一起绑架案让龙战挺身而出，没想到也因此卷入了一场惊天密谋。 面对贩毒团伙的威逼利诱，龙战能否保持军人的使命与初心，协助警方侦破大案？
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