K.O. | Official Trailer | Netflix

Bastien (Ciryl Gane) has lived as a recluse ever since he accidentally killed his opponent Enzo in an MMA fight three years ago.
Enzo's widow tracks him down and asks for his help: Bastien is her only hope of rescuing Léo (Maleaume Paquin), her teenage son who has gone missing in the northern districts of Marseille.
Bastien sets off looking for him. Along the way, he meets Kenza (Alice Belaïdi), a young cop who is prepared to do anything to bring down the new crime lords of Marseille. Léo is in grave danger and time is of the essence.