Yeung Tai-chi (Aaron Kwok), a newcomer investigator of the ICAC, is met with frequent failures, but he remains optimistic. Chiu Wing-yee (Athena Chu), also a new member of the ICAC, is so aggressive that she always challenges Chi. Police officer Yau Lok-sang (Ben Ng) gets to know Leung Siu-man (Esther Kwan), who is blind, by chance. He is attracted by her optimistic personality and the two become lovers. Though Chi and Yee quarrel often, they manage to discover various briberies and they eventually fall in love. In the course of investigation, Chi is forced to make decisions between love, friendship, family and justice, and has difficulty in facing the dilemma.