Uma, tired of waiting for the man of her dreams to raise a family, decides that Nico, the boyfriend of her best friend Lucy, has all necessary features. So she asks her a favor: to lend her boyfriend once. In the middle of surprising situations, Uma convinces Lucia and Nico. That way it starts what first seems "a simple procedure"...

Sebastián, an architect in crisis with his wife, occasionally passes through a small town. Mariela, an orphan girl, believes him to be the one sent by God for whom she has been praying and lies in town saying that he is her uncle and that he has come to take care of her. Sebastián begins to relate to Mariela and her past. The lie grows, Sebastián begins to doubt his true identity and Mariela, and the whole town, will try to prevent him from leaving.