In the village of San Andres, the rivalry between two families the Valdez and the Ramirez is centered on "El Manantial", a beautiful fountain of water that happens to bathe the small property of the Valdez and not the neighboring ranch, the rich and prosperous hacienda "Piedras Grandes", where the best cattle are raised and is property of the Ramirez. But the spring is not the real reason for the hatred between the families. Justo Ramirez, married to Margarita Insunza, had a relationship with Francisca Rivero, wife of his enemy and neighbor Rigoberto Valdez. This relationship, founded in the betrayal, will cause the utmost bitterness and the destruction between the two families. The Valdez have a beautiful daughter named Alfonsina, who was born in the same year as Alejandro, the son and heir of the Ramirez. Although they have grown separately with their souls full of prejudices against their respective families, the two cannot avoid feeling attracted to each other. Margarita will not permit this and so she tells her husband to make sure her son will never be together with Alfonsina so he could marry Barbara, her cousin's daughter. Justo rapes Alfonsina and she leaves along with her mom and her aunt. Five years later... Alfonsina is graduating from school and has a good life until her mother commits suicide because she found out she was deathly ill and could no longer live with the guilt of her lifestyle. Before dying, her mother confesses to Alfonsina that Justo Ramirez destroyed her life and after that Alfonsina vows revenge on the man who destroyed her family. She returns to San Andres and there she once again sees Alejandro who is now engaged to Barbara. Their love is still present in their hearts. They will have to fight for their love and see if they can be happy by the shores of El Manantial.