Paola and Paulina are twins who were separated at birth. Paulina is a good, honest woman who lives in poverty and is engaged to a simple man, named Osvaldo (who is seeing another woman). Paola though rich, is a frivolous, evil woman who has many lovers, including her brother in-law Willy. She is married to a wealthy man named Carlos Daniel Bracho. When the twins cross paths by chance, Paola attempts to convince Paulina into taking her place in the Brachos' house, so that she can take a year-long vacation with a new lover, Alessandro. At first, Paulina refuses because she can't leave her mother who is deathly ill; but is later blackmailed and forced to take Paola's place after Paola puts her bracelet in Paulina's purse and accuses her of theft and threatens jail. Paulina, abandoned by her fiancé Osvaldo and after the death of her mother, with nothing left in life to do submits to Paola's plan. Paulina, unaware of the destruction the Bracho household was under (thanks to Paola) decides to work throughout the year righting all wrongs. She strives to convince everyone that she is a "changed woman" and a "new person". During the year, Paulina falls in love with Carlos Daniel.