After incurring debts from his failed business venture in China, Chung Wah returns to Hong Kong after a decade's hiatus. The demoralised Chung Wah faces problems finding a job and tries hard to get used to things at home, including his estranged relationship with his stepfather, who runs a Cantonese opera troupe, and half-sister, who is hostile towards Chung Wah as she always has the impression that the death of their mother was caused by the excessive fights between Chung Wah and his stepfather.
Ming, a single parent, is forced to bring up his kid Xing because his wife left - no thanks to his gambling habit. That vice is still not kicked, and father and son spend occasional days on the run from loan sharks. Serendipity strikes when the runaway dog Dou Dou gets rescued by Xing, and despite his dad's disdain for canines, brings him home. Through a series of oh-so-cute-inducing scenes, Xing finally gets to keep his current best friend.
An elite team of six female rookie police recruits fails to graduate as they resist to retreat in the final test when the situation gets out of hand. But their eminence provides them with another opportunity – “The Rafflesia”, a special female force that was disbanded 25 years ago when the mission failed, which is now looking for new blood to resume operation. Their first mission is to capture the notorious triad leader “President”, who caused the disbandment of “The Rafflesia” 25 years ago. He takes hostage of medical scientist Yoshida for his knowledge in virus to threaten different countries and ultimately plot a physical robbery. Eager to become real police officers, the girls accept the offer despite the level of danger involves.
Captain Lin Lang leads "Shadow", an elite 4-man mercenary team famed for flawless missions and zero casualties. When their broker delivers a bullet-sealed letter (an unrefusable contract), a deadly game begins...