 Fabrice LuchiniArthur Dreyfus | Arthur Dreyfus |
 Patrick BruelCésar Montesiho | César Montesiho |
 Zineb TrikiRanda Ameziane | Randa Ameziane |
 Pascale ArbillotVirginia, Arthur's ex | Virginia, Arthur's ex |
 Marie NarbonneJulie Dreyfus, daughter of Arthur and Virginie | Julie Dreyfus, daughter of Arthur and Virginie |
 Jean-Marie WinlingBernard Montesiho, father of César | Bernard Montesiho, father of César |
 André MarconThe priest | The priest |
 Thierry GodardDoctor Cerceau | Doctor Cerceau |
 Martina GarcíaLucia | Lucia |
 Sébastien PierreMaître Lansky | Maître Lansky |
 Philippe RésimontCodaven, director of the laboratory | Codaven, director of the laboratory |
 Rajat KapoorDoctor Aman Kapoor | Doctor Aman Kapoor |
 Marie-Julie BaupBiker girl with the cigarette | Biker girl with the cigarette |
 Yilin YangChinese waitress | Chinese waitress |
 Adèle SimphalStudent | Student |
 Lilou FogliEmergency room employee | Emergency room employee |
 Guillaume ClériceMaître d'hôtel | Maître d'hôtel |
 Laurent DassaultResearcher | Researcher |
 Maud Le GuénédalHospital nurse | Hospital nurse |
 Jocelyne VignonAssistant | Assistant |
 Christian ValsamidisThe abbot | The abbot |
 Celia DianeHostess at the airport | Hostess at the airport |
 Rafaël RajabianArthur as a child | Arthur as a child |
 Théo HellermannMan on the street (uncredited) | Man on the street (uncredited) |
| JJosiane CombescureFriend at the funeral (uncredited) | Friend at the funeral (uncredited) |
