Kleber is seventeen, his older brother Brainy is twenty-two, but he has the brain of a three-year-old. In early childhood, due to a genetic disease, he stopped developing. After the death of the boys' mother, the father sends Clever Man to a boarding school, from where Kleber takes him and the brothers go to Paris. There they rent a room in an apartment already occupied by four students. This is where the fun begins.