[1] On Monday, October 1, 2001, Canal de las Estrellas started broadcasting El Manantial weekdays at 9:00pm, replacing Sin pecado concebido.

Justo Ramírez (Alejandro Tommasi), married to Margarita Insunza (Daniela Romo), maintains an adulterous relationship with Francisca Rivero (Azela Robinson), the wife of his rival and neighbor, Rigoberto Valdés (César Évora).

The Valdés have a beautiful daughter named Alfonsina (Adela Noriega), who was born at the same time as Alejandro (Mauricio Islas), the Ramírez's only son and natural heir.

The loss of the property forces Alfonsina's family to leave San Andrés; hurt, she swears that she will do everything in her power to get back the land that belonged to her grandparents.

Thus, thinking that they have finally got rid of their eternal enemies, the Ramírez decide that the best candidate to be Alejandro's wife is Bárbara Luna (Karyme Lozano), a pretty but calculating and somewhat frivolous young girl.