Ho Sau, an undercover agent, has been working with Yau, a drug lord, for years, but his job and family are in trouble.
After suffering life changing injuries in the line of duty, bomb disposal officer Fung turns his back on the police. But when a devastating series of bombings sweep Hong Kong, the police suspect their former ally may be involved after he is found unconscious at a crime scene. Now faced with memory loss and recalling only fragments of his former life, Fung sets out to uncover the truth and find out who he really is.
A young woman lives, hidden in plain sight in a ruined Hong Kong building after a tsunami destroyed the city - a castaway on a concrete island. Her concealed existence is changed forever when a small child literally floats into her life.
Ah Fat, a lonely man arrives in a strange country, escaping from his past and seeking salvation. Living in a constant state of psychological turmoil, redemption was never quite in reach. Making friends with Miumiu, a coworker who is a gogo girl and a male gigolo Pumpkin turns Ah Fat's life around; he finds a strange, unique sort of happiness in friendship that had evaded him for a long time. Then comes a turn of events that changes everything; Ah Fat will have to choose between saving his friends by killing the evil shop owner, and standing idly by. This is the final straw; Ah Fat is pushed to the brink, all hell breaks loose...