Juan Carlos Caballero Mistral (Jaime Camil) is a busy man working in Grupo Imperio. He is a womanizer who can never get enough. Juan feels he just enjoys the company of women. Everyone in the industry feels he is just a man who plays with women's feelings. But when Helena Moreno Romero (Lucero), a single mother of one son and an ex-employee of Grupo Imperio, enters Juan Carlos' life, he begins to have feelings for Helena, something he has never felt before. Helena regains her position at Grupo Imperio and starts a huge project. They fall helplessly in love with each other and plan to marry and start a family with Helena's son Eduardo (Lalito). Although, given his background, Helena hates Juan Carlos Caballero and Juan Carlos pretends he is Juan Perón, son of an Argentinian ambassador. Helena finds this out and is heartbroken. She feels Juan tricked her and was looking for another "adventure,"and also feels he tried to steal the project she had been working hard on. Later Plutarco Ramos Arrieta (Marcelo Cordoba) frames him for embezzlement. While in his car, Juan Carlos hears the police sirens. He is chased by the police until he falls of a cliff and his car explodes. Thinking he is dead, the authorities publicize the message that Juan Carlos is dead. Helena is mourning and feels she will never forget her great love for him. Meanwhile, Juan Carlos is still alive but in hiding. He meets Mimi de La Rosa (Patricia Navidad) and they become extraordinary friends. He tells her his whole story and how he must clear his name. Mimi helps him transform from Juan Carlos Caballero to Eva Maria Leon Jaramillo viuda de Zuloaga. He watches out for Helena and her son while trying to find evidence to clear his name. Although it becomes a very different and difficult life being a lady, Juan Carlos starts to realize his mistake and the consequences of being a womanizer. Eva/Juan applies for a job as Helena's assistant. She/he gets the job and at first, does not get along well with Helena. But soon they become the best of friends. Plutarco falls in love with Helena and becomes Juan's (biggest) enemy. Plutarco proposes to Helena, and Helena accepts. Although Plutarco had a wife, Antonia Reyes de Ramos (Christina Pastor) who died of a heart attack, he also has an ex-lover, Rebeca Oropeza (Mariana Seoane). Rebeca becomes his worst enemy; she is determined to ruin their relationship. But Juan is crushed and gives Helena every reason to hate Plutarco. As Eva, Juan will regain Helena's love, clear his name and realize his dream of being married and having a family with her.