Mainland cop travels to Hong Kong to team a Hong Kong police officer in order to investigate a case involving a brutal killer.

Alex Man leads a cast of Mainland Chinese characters having survived political turmoil but still gets on the criminal path in Hong Kong in order to make a living.

Chang Mi-Hua returns from Canada to take over an incompetent unit of the HK Police force.

Min is an assassin. His adopted son Eagle and his son KK kill another assassin, Michael, because he broke the rule of the assassin group. This breeds contempt in Panther, Michael's brother. He tries every means to identify Eagle and wants to kill him. When all come to failure, he frames Eagle to have broken the group's rule.

Acclaimed actor Danny Lee, known for his role in john Woo’s The Killer, has his directing debut in One Way Only, a Hong Kong Easy Rider, where the road and motorbikes are symbols of freedom against government oppression, which Jack Kerouac’s sees as a way of discovering oneself. Li plays a motorbike workshop owner that although injured during an illegal motorcycle race, continues to race regardless of the physical consequences and the law, because the road rules all.

Little Tiger ventures from the sticks to the big city in search of his cop brother Big Tiger, an honest cop working in a corrupt system. Surmising that life in the police force was not his cup of tea, Little Tiger joins the Swallow Acrobatic Troop, which he excels in because of his kung-fu prowess. When a band of thugs from Chin Hung-yun's group attacks the troop, Little Tiger not only handily fights them back but also infiltrates their organization to destroy them from the inside. Meanwhile, Big Tiger's old flame Mary returns from America to join the revolutionaries. Big Tiger soon finds himself torn between his love of this girl and his orders to arrest all revolutionaries.

Fai Chuen is a young man who wants to rise in the triad of Hong Kong. He's tough; he's respected by his friends; he loves Apple, daughter of his boss in the small-time Hung Lok gang in Wanchai; and, he encourages the studies of Chun, the son of his mother's closest relative. When Chuen comes to the attention of Piu, a top triad boss, the Hung Lok gang is assigned a hit; Chuen commits the murder and then is frustrated when Apple's father takes the fall. Chuen's cockiness gets him in trouble again when he disobeys Piu to revenge a friend's death. Chuen, who's reached the police bulletin board's most wanted, is now expendable. Can he and Apple escape to the Mainland?

Cat is a professional killer falling in love with John, a police investigator. John feels torn between his job, his ex-wife and child, and Cat of course.