Original broadcast of the series began on TVB Jade channel from February 2 till April 9, 2004 at 9:30-10:30 p.m. timeslot with 40 episodes total.

Chan Siu Sang (Bobby Au-Yeung) and Wai Ying Zi (Ada Choi) have been dating for a while and seems to be in a stable relationship.

Having gone through so many tragedies in the past Chan Sam Yuen (Joyce Tang) finally decides to focus on her family as top priority.

In February 2020, a sequel set over ten years later began production under the working title Armed Reaction V with new leads Jessica Hsuan and Moses Chan.

The only main cast member to return is Joyce Tang but after suffering a ski injury in Japan, her role was significantly reduced appearing in only 8 out of 30 episodes with many of her action scenes cut.