Hong Kong police Inspector Kevin is an expert cop specializing in tackling the Vietnamese gang and the big circle gang. He breaks a kidnapping case quickly and killed Tiger. However, the head of the Vietnamese gang has ordered their men in America to kill all Kevin's families. When Robin, the brother of Tiger, knows that Kevin has killed his brother, he swears to make Kevin pay in blood.

After Robin has brutally slain the whole family of Kevin's sister, he flees to Hong Kong. Conan, brother of Kevin, flies from the States to Hong Kong and teams up with Kevin. Robin decides to kill Kevin's wife before he escapes. However, his trick has already been fallen into the expectation of Kevin and Conan. This result in a death-and-live battle you will never forget…