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| Guillaume Canet | Julien |
| Marion Cotillard | Sophie |
| Thibault Verhaeghe | Julien à 8 ans |
| Emmanuelle Grönvold | Julien's Mother |
| Gérard Watkins | Julien's Father |
| Elodie Navarre | Aurélie Miller |
| Gilles Lellouche | Sergei Nimov Nimovitch |
| Julia Faure | Sophie's Sister |
| Laetizia Venezia | Christelle Louise Bouchard |
Close childhood friends continuously dare each other to pull pranks in a twisted game of one-upmanship.
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