"The Last Conflict" follows Cheung Wai Kit, a police cadet from the UK, who returns to Hong Kong for training and ends up getting involved in a dangerous undercover operation. The story centers on Cheung and Inspector Kit, a tough but righteous officer investigating a crime syndicate connected to arms trafficking.

As Cheung adapts to the rougher streets of Hong Kong policing, he becomes emotionally involved with Maggie, Inspector Kit’s sister. Their relationship is tested by the rising stakes in the investigation. Tension builds as the team uncovers the involvement of an international arms dealer, culminating in an intense and emotional showdown.