Oscar, Simon, and Aïssa, three childhood friends, go to Paris to celebrate some good news. But on the night bus taking them home—the N121—an exchange between passengers spirals out of control, and the situation quickly goes off the rails.
| Actor | Role |
|---|---|
 Riadh BelaïcheAïssa | Aïssa |
 Bakary DiomberaOscar | Oscar |
 Gaspard Gevin-HiéSimon | Simon |
 Mylène JampanoïJohanna | Johanna |
 Paola LocatelliMona | Mona |
 Arben BajraktarajDimitri | Dimitri |
 Jérémie CovillaultBarth | Barth |
 Damien JouillerotPhilippe | Philippe |
 Audrey MarnayJosiane | Josiane |
| AAissatou Diallo SagnaAminata | Aminata |
| LLaurence OltuskiMarie-Andrée | Marie-Andrée |
 Azad BoutellaAbdel Ali | Abdel Ali |
 Lucie Charles-AlfredSarrah | Sarrah |
| BBounsy Luang PhinithMathieu | Mathieu |
 Beidja YahiaouiSamia | Samia |