It is July 1st of 1997, and Hong Kong is bright in celebration. The United Kingdom handover of Hong Kong to the People's Republic of China leaves Ga Yin, and his fellow soldiers without work. Which leads them to find employment and money any way they can get it. Without much success, Ga Yin decides to join his brother Ga Suen in the triad gang world.

In 1997, Little Cheung is a street-wise nine-year-old boy living in a bustling neighbourhood of Hong Kong, just before the reunification with China.

Hotheaded cop Bill Chu gets relegated to the Emergency Unit after a dustup with his inept boss. When the mob kills Chu's pal and ex-colleague during a turf-war hit, he rounds up his motley department cohorts and embarks on a mission of revenge against the gangsters.