Jean-Louis, 25, is a naive: he has always lived with his grandfather in his lost village. But Pepe is dead, and Jean-Louis goes to Paris to meet the yellow-haired girl like the fries, a Parisian woman who, once in the village, one day made her discover love. He kept only a "Fast Burger" matchbox. Entering the first Fast Burger, he is engaged, taken for a model, climbing very quickly in the hierarchy without really understanding what happens to him ... One day he finds his dream, the girl with yellow hair, who pushes him back . In the subway, Jean-Louis meets Henriette, a mother-in-law who recognizes his soulmate.