Lao Zhao (Wang Zhiwen), a killer who has never failed, suffers from Parkinson's disease and is about to retire, but he receives two orders at the same time. At the same time and place. The target of one order is the client of the other order. In order to make up for a long-standing guilt in his heart, Lao Zhao decides to use this last chance and make a desperate effort to earn both sums of money. However, a huge and complex abyss is quietly waiting for him...