Chau (Patrick Tse), Fung (Petrina Fung) and Chung (Lam Suet) were once a feared trio of professional killers in the sixties, but that's all in the past. Now in his twilight years, Chau can only use his knife to cut dough to make noodles. Fung, who has property and grandchildren, seems to be doing well, but in reality, her family relations are bad. Chung is a lonely man whose love for a prostitute is not reciprocated. One day, the trio unexpectedly receives a job to assist a client's suicide. Thus, they begin a new line of work assisting ill and elderly people end their lives. They believe that they are helping their clients until they receive a request from an abused and orphaned teenage girl (Chung Suet Ying).