三十年代的上海滩，胆小如鼠的青龙帮小弟闫大海发现自己身患绝症之际，竟阴差阳错当上了警察。为了给梦中女神--飞乐门舞女杜卿挣赎身钱，他计划在自己生命中所剩不多的时间里因公殉职，从而拿到抚恤金拯救女神。然而，在他疯狂执行铲除“黑帮”、“毒枭”任务以身赴死期间，却总是事与愿违求死不得死，反而得到屡屡升迁。然而，纸醉金迷的上海滩，还隐藏着更大的危机……Set in 1930s, Shanghai. Yan Dahai, a coward little guy of Qing Gang, is diagnosed with incurable disease while he joins the police by chance. He plans to make himself a death in line of duty to get enough pension, so he could buy back freedom of his dream girl, a dance hostess of a club. But everything goes in the opposite direction. Yan does not die in dangerous missions, becomes a hero and is promoted again and again.