Shan is a good cop who has solved a lot of cases. When his sting operation is attacked by a mysterious group of criminals led by Ngo, his former protégé, his past comes back to haunt him. Ngo was once a talented cop who looked up to Shan. However, a terrible accident three years ago landed him in prison, transforming him into a rage-filled man hell-bent on killing everyone who has wronged him.