Sagrario Molina is a young woman who has dedicated herself to help others. She is a teacher of biology in an exclusive collage for girls and in her free time she voluntary attends a shelter for the children with cancer. After the death of her mother, she also takes care of her widow sister and her two nephews. In thecollage , Sagrario meets the stranger who, five years ago, consoled her when her mother passed away, and whom she always remembered. Luis David Luján is a famous journalist who also gives classes of literature in thecollage . Eventually Sagrario falls in love with him. Nevertheless, Luis David is also being courted by the student Maria Elena Eyzaguirre. Maria Elena is a capricious and spoiled daughter of a rich man, Guillermo. Her father has given her all the luxuries, but not his paternal love. In order to flee from the sexual harassment of his student, Luis David marries the timid Sagrario, but Maria Elena manages to separate them. Sagrario divorces only to discover that she is pregnant. Then Guillermo Eyzaguirre enters her life and offers her help, and Sagrario ends up being the stepmother of Maria Elena.