A former police officer tries to find out the identity of a serial killer from his time of investigation. A good chinese film, especially in terms of photography, with very interesting plans, from a colder (literally) and less fanciful part of the country. The narrative has a very classic noir and melodramatic mood, which helps to involve with what's going on on the screen. It starts out with a slow pace, but quickly becomes captivating when the second act begins. A story full of intrigue, secrets, and an atmosphere of suspicion almost to the end. One of those films where it's hard to tell who's the hero and the villain.