In 1970s Hong Kong, the Independent Commission Against Corruption (ICAC) was formed to bring down the corruption syndicate led by British government officials. One of its top investigators is Senior Investigator Lau Kai-Yuen, who brought down countless corrupted officials. Just as he thought stability and prosperity are within reach, a new era of greed and riches takes him into a new battlefield of corruption.

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.

When a terrorist who specializes in explosives takes hold of an underground tunnel, he threatens to kill hostages if his demands are not met.

Cheung Sung-bong is a highly respected cop with a long history of success in dangerous cases. However, his past soon comes back to haunt him when a former protégé resurfaces, seeking revenge.

A fortune teller fails to help a prostitute who is facing a deadly calamity. When he meets a young boss of a tea restaurant, he predicts that his bloodthirsty tendencies will lead him to a prison sentence for murder.

“Once clothed as an official, you represent law and justice.” This was taught to young detective Xian who worked under Detective “Silent Dog” Ao to catch mountain robbers. To everyone’s dismay, the robbers turned out to be detectives from neighbouring counties who were forced to rob the ruling county to save the poor. Through trickery and lies, Ao started a bloodbath to kill the robbers. Shaken to the core by Ao’s deceit, the originally naïve Xian abandoned his dreams to uphold righteous values. Not to be outdone, he ended up murdering the treacherous Ao for his own gains. With blades and blood, Xian was later hailed as a legendary detective.

This is a city where personality traits, psychology and interest are quantified in order to assign a ‘perfect match’ for qualified members of the society. Boundaries are drawn by a state of 'perfection' maintained by the pairing system, while those wishing to find their partners at their own will are to be expelled. Growing up in the outer circle, Shun has always been longing for finding 'the one' through the pairing system. Emma, on the other hand, keeps a secret from her loving partner assigned by the system. When their paths cross, they are walking without a direction.

A pair of homeowners are left in debt as their deposit goes up in smoke as the law firm they entrusted had suddenly gone bankrupt. On desperation, the husband takes to robbery which by chance spins him into a web of murder and intrigue with a girl who also breaches the law because of money.