Betty arrives at Ecomoda for an interview for the position of presidential secretary with a brilliant resume, but finds that there is a candidate with a better chance than her.

Armando decides to hire Patricia and Betty as presidential secretaries and even though Betty is given the warehouse room as an office, Armando gives Betty the most important duties and Patricia the responsibility of public relations except for her personal agenda, which infuriates Marcela.

During Betty's first buyers' parade, she makes a mess when she tries to help Armando when he gives her a color chart he's requested, Betty gets in the way of the parade and falls off the stage.

Armando reiterates to Betty that the personal planner cannot be given to anyone. Marcela arrives at the office to complain about him leaving Patricia out of his personal affairs. While they argue about fidelity, Karina Larson, one of the models with whom he had a relationship, arrives. Betty tries to get her out of the company.

Betty tries to hide Karina's presence in Ecomoda, she makes Armando take her, but Patricia has seen her and goes and tells Marcela. They try to take Betty's agenda while Armando has left taking Karina.

Marcela asks Betty to hand over the position to Patricia, especially the diary. Armando arrives and tears up the letter and argues with Marcela. He thanks Betty for what she did and tells her that she no longer needs a probationary period because the probationary period will expire in one of these days. Mario tries to convince Armando not to get married, creating a computer program for him to find the ideal woman.

Marcela sues Armando about his womanizing past, eventually seducing him and forgiving him, promising not to interfere in his company affairs again. Román calls Betty to confirm his invitation to go out. After a discussion with his father, he gets permission. Betty waits to be picked up even though more than an hour has passed.

Betty cries inconsolably because they did it to her again, leaving her stuck. Nicolás, furious, complains to Román, who punches him. Hermes, Betty's father, arrives to complain about Román's trick on Betty, and they end up punching him.

Betty secretly prepares a project to surprise Armando and stand out at the meeting. Patricia overhears this conversation where Betty tells her mother this. Patricia is plotting something. Armando sits down with Betty to file the agenda.

Betty confronts Román and humiliates him. Patricia, assisted by Marcela, asks Betty for the reports, and Patricia hands them over as if they were hers, for which she is congratulated. Armando and Marcela doubt the need to have Betty if Patricia is capable of such an efficient job. At the headquarters, they invite Betty to lunch and tell her the company gossip.

The ugly women tell Betty the story of Ecomoda, its characters, family gossip, and Armando and Daniel's rivalries. Daniel asks the board to carefully review Armando's proposal, considering it impossible to fulfill.

At the end of the meeting, they congratulate Patricia on the report. Betty confronts her, but Marcela intervenes and convinces Betty not to tell Armando that the report was hers. The Ecomoda employees give Roberto a farewell serenade.

Armando asks Betty and Patricia to help him prepare the business plan, but Betty cleverly tells him that since Patricia wrote the report, he should do the project. She furiously agrees and asks Mario for help. Betty, in turn, asks Nicolás for help with the report.

Betty and Nicolás work on the project all night. Mario and Patricia prepare dinner and talk about love. When Patricia tries to get him to work, Mario seduces her, and they wake up in bed.

Betty spends all night doing Armando's work, but finds Armando furious because she's late. Patricia and Mario arrive late and without work. Betty doesn't get a chance to hand in the work to Armando. Hermes arrives at Ecomoda to talk to Armando.

Betty, terrified, tries to stop Hermes from fighting with Armando; meanwhile, Armando, furious, admits to Marcela that Betty is of no use to him and that he's going to fire her. Armando fires Betty without giving her the chance to hand over the work she did for him.

As they say goodbye, Betty hands him the report, and he, surprised and fascinated, hugs Betty and sits down with Mario to review it. Patricia tells Marcela about the wonderful night she spent with Mario and the possibilities she has of getting married.

Marcela and Patricia are deeply frustrated to learn that Betty wasn't fired, but that she actually created the business plan that Armando and Mario are very happy with. Mario tries to avoid Patricia.

Daniel warns Olarte that from now on he has to take care of Betty and any move she makes.

Betty becomes convinced that Armando is the love of her life after Mariana reads her letters. Armando announces to everyone that Betty will take over the financial management, taking over from Olarte. Patricia seeks an alliance with Olarte to fight Betty.

Patricia, to make Mario jealous, has Marcela set her up with his brother Daniel Valencia, which ends up being a failure due to Daniel's disdain for her. Aura María invites Betty to go out with some friends.

Betty goes out with Aura María and her friends to a nightclub, where both Betty and Aura María's friend are bored, as the man is disappointed that Betty isn't the woman he expected. Betty is terrified by Aura María's behavior with her friend.

Betty lies to her parents. Julia, her mother, is happy, convinced that Betty has met someone. Armando delegates responsibility for managing relations with the bank to Betty, overruling Olarte.

Armando thanks Betty for everything she's done for him, and she takes it as a declaration of love. A few months pass. Betty interrupts a racetrack at the club to get Armando to sign a promissory note for the disbursement of a loan. Marcela is shocked to see that Armando doesn't scold her but instead congratulates her for what she did.

Despite Marcela's fury, Armando asks Betty to stay and join them for lunch with the executives of RAG-TELA, a textile company, and once again Betty saves the business. Armando appoints her Assistant to the President. Betty cries with emotion.