Andrea San Vicente is a young lawyer, she is modern and intelligent. She has a passion for justice and the rights take her to defend those who can't defend for themselves. That same passion will lead her to her past, which she doesn't know anything about. Andrea lives in a house in a private section of the middle class in Mexico City with her uncle Anselmo and her aunt Zulema, her younger sister Gina and her cousin Magda. Zulema has told the girls that the parents of Andrea and Gina, Enrique and Alicia, died in an accident. But the reality is another. Andrea and her sister have grown up in a family in which Zulema tells them that they should be thankful for what they have done for the two: they gave them a family, and they educated them. This makes Andrea the main source for money in the family, since her uncle Anselmo has diabetes for years and this doesn't allow him to work. Andrea falls in love with Ramiro, a young man of better economic position than her.