We all experience birth, old age, sickness and death. Yet have you ever wondered who determines the time of our death? Respected pharmaceutical doctor Kong Tung-Kin starts up his own clinic after a drug trial incident. One day, he is approached by Toi Fung, who claims to be a reaper, for a patient's life. Refusing to do so, he suggests handing over his own. His reaction takes Fung by surprise. With a view to getting to know more about human being, Fung interferes with Kin's life, including his family and career. In addition, he runs after Fong Siu-Fong, a nurse who Kin has been secretly in love with. Later, Kin sells his soul to Fung for money and fame. As time goes by, he starts to become a totally different person, losing his kindness without himself knowing it.