The producer of the film, Mark Canton, was once famous. He was the vice president of Warner Bros. and the president of Columbia Samsung Pictures. His film works spanned multiple types. Canton positioned the film as a "realistic thriller". In order to make the content of the film authentic and credible, the crew invited Sergeant Francois Doyle from the Montreal Police Department to act as a consultant throughout the whole process and consulted with a number of experienced Crime analysts, so that the film has no omissions from a professional point of view.
Doyle admits frankly that it is easier to deal with murderers, drug dealers and thieves than with filmmakers, because he and his colleagues must teach the actors how to hold a gun, how to raise a gun and enter the room, how and where the plainclothes police detective will do. Wear a police badge at the place. In addition, Montreal not only provided police uniforms, but also allowed officers from the special police department and the A Witness out of the Blue investigation department to act as background actors.
