Hong Kong police agent Cheung (by Aaron Kwok) works undercover in Kang’s (by Sean Lau) drug cartel, while another undercover cop Au (by Louis Koo) successfully earns their trust in an incident, a brotherly-bond is built among the three. After the Police busts the syndicate in Hong Kong, Kang subsequently hides away in the Golden Triangle, by chance he receives a tip-off about the betrayal within his circle of trust…

Bull's father got his eye blinded for protecting his best friend, Hing. Since then, he hid away from friends and lived a quiet life with Bull. Years later, the two brothers somehow meet again. Hing run a boxing club and he promised Bull’s father to train Bull well. Under Hing’s teaching, Bull becomes a very skillful boxer.

In the near future, Major is the first of her kind: a human saved from a terrible crash, then cyber-enhanced to be a perfect soldier devoted to stopping the world's most dangerous criminals.