Fabrice Luchini
Arthur Dreyfus

Patrick Bruel
César Montesiho

Zineb Triki
Randa Ameziane

Pascale Arbillot
Virginia, Arthur's ex

Marie Narbonne
Julie Dreyfus, daughter of Arthur and Virginie

Jean-Marie Winling
Bernard Montesiho, father of César

André Marcon
The priest

Thierry Godard
Doctor Cerceau

Martina García
Lucia

Sébastien Pierre
Maître Lansky

Philippe Résimont
Codaven, director of the laboratory

Rajat Kapoor
Doctor Aman Kapoor

Marie-Julie Baup
Biker girl with the cigarette

Yilin Yang
Chinese waitress

Adèle Simphal
Student

Lilou Fogli
Emergency room employee

Guillaume Clérice
Maître d'hôtel

Laurent Dassault
Researcher

Maud Le Guenedal
Hospital nurse

Jocelyne Vignon
Assistant

Christian Valsamidis
The abbot

Celia Diane
Hostess at the airport

Rafaël Rajabian
Arthur as a child

Théo Hellermann
Man on the street (uncredited)