Justo Leal y Aventado (Cantinflas) is a law intern who receives classes from an old lawyer, Professor Ramón Arvide (Ángel Garasa), already retired, who lists the many ways Justo reminds him of the title character of "Don Quijote", saying "You are a supporter of justice; you like to help the poor, even knowing how little, or nothing, they can give you.