Based on real-life crimes that terrorized Hong Kong in the 1990s, Logan (Tony Leung Ka-Fai) is the head of leading a notorious human trafficking gang, abducting the children of Hong Kong's elite. Police forces decide to send in Sky (Louis Koo), a Hong Kong undercover agent whose mission is to infiltrate and save the hostages, all while bringing the gang and their leader to justice.

The film tells stories about four families with different races. By participating in an inter-school competition, reflecting a group of students in 6E class, from encountering different racial conflicts and issues, to putting all the differences by and work together for a common goal.

A man kills an assassin by accident and when he gets out of prison, the victim's brother attempts to avenge his death.

A low level gangster in Hong Kong gains new respect after saving a boss's life in a gang fight. Despite his wife's death in this attack, he appears to be moving up in the Triad family until he discovers the other bosses are not looking out for him when he is double crossed and the gangster he previously hospitalized in the gang fight comes back for revenge.

Three police officers attempt to nab a serial rapist and pursue him to a construction site. The suspect's body is found dismembered later, with his limbs and torso scattered around three different locations at the site.

Hong Kong movie

While investigating murder cases involving masked rapists, Officer Ling herself is raped and her husband murdered by the suspects, on their wedding night. Rather than relying on her fellow police officers to solve her case, Ling chooses to use her own body as the weapon to take revenge on her violators.