Shan (Yen) is a righteous cop who’s solved countless cases. One day, his past comes back to haunt him when his sting operation is attacked by a mysterious group of criminals led by Ngo (Tse), his former protégé. Ngo was once a talented cop who admired Shan. However, a terrible accident sent him to prison three years ago, transforming him into a furious man dead set on killing everyone who’s wronged him.