Nima Yangzhen is a postman at the post office of Diqing Tibetan Autonomous Prefecture. She is a ordinary mother of a baby, but with professional skills and enthusiastic work attitude, Nima was recommended to participate in the selection of exemplary people in the autonomous prefecture. After winning she receives a job transfer order. She needs to leave her family temporarily to go to the remote Yunling Township to take over the job of the old post office director.

In 1995, the year before the comprehensive gun ban policy was implemented, the tranquility of Mangya Town was shattered. A notorious bandit leader, who had hidden a massive treasure, broke out of prison. Forty-three ruthless outlaws gathered from all directions, joining their leader, Beishan, in blockading Mangya by force. The entire town was plunged into a desperate crisis—cut off from fuel and communication! The bandits wanted both money and lives. Gunfire erupted across Mangya as a massive sandstorm loomed on the horizon. Facing impossible odds—one gun against eighty-eight—the gang also turned on each other in a brutal "dog-eat-dog" power struggle. Surrounded by enemies, with sandstorms blotting out the sun and death hanging by a thread—how can they turn the tide?