Pierre Jolivet's wife suggested Marc Lavoine for the role of Julien Bass, the dirty chief of Maya's narc squad, much to the actor's surprise as he'd never played that type of character before.
Leïla Bekhti was apprehensive at the thought of playing a cop and met with several female officers holding the same job as her character to discuss the role.
Pierre Jolivet chose not to finalize the script before wrapping up his location scouting, so that he could properly incorporate the "look" into the screenplay.