Hong Kong Customs and Excise Department officers Chow Ching Lai and Cheung Wan Nam share a close mentor-student relationship. On a case involving seized smuggled arms, Chow is sent to take part in a joint operation with Interpol to capture a reclusive arms dealer. However, Cheung makes a drastic decision that further complicates the case.
Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.
A poor young man is wrongly charged with drug trafficking after being deceived. An ex-prosecutor investigates the case, uncovers a corrupt lawyer team's scheme, and restores justice despite obstruction from evil forces.
