Juan meets Josefina when he almost runs over his grandmother Augusta with her bicycle and falls in love with her. But Serena, her ambitious stepmother, does not stop until she makes Juan fall in love with her. Josefina's family is very problematic: her mother Alicia throws her father Emilio out of her house because she has pregnant the police superintendent Eugenia Gutierrez. Manuel, her beautiful brother, feels sorry for a prostitute and tries to help her, and is furious when she discovers that her father, Emilio, raped and threatened her. Josefina goes out with a Chilean named Franco, who makes diabolical plans with her father Emilio. She has to marry him because, supposedly, he will die.