Criminal Lovers (2000)

A woman is looking for revenge and kicks but ends up finding a lot more than she counted on in this drama. Alice (Natacha Regnier), a sexy and knowing young woman, one day presents her more naive boyfriend Luc (Jeremie Renier) with an unusual request -- "help me kill somebody." Alice has a somewhat reasonable explanation, claiming that the intended victim raped her and she's out for justice, but unknown to Luc, Alice has long had a fascination with violent crime and nihilism. Luc agrees to help Alice, and together they stab Said (Salim Kechiouche) until he's a dead and bloody mess. They drag Said's corpse to the woods for burial, but before they can finish covering the body, they're discovered by a strange man who lives in the woods and makes his way by trapping (Miki Manojlovic). The trapper insists that Alice and Luc are trespassing on his land, and he drags them back to his cabin, locking them in the cellar while he decides what to do next.