Arturo's sister, at first distrusts Teresa, until her "sweetness" convinces her that Teresa is just a humble, but kind girl. While Teresa works for Arturo as an assistant, he unintentionally falls in love with her. Luisa discovers this and convinces Arturo to confess his feelings to her. Teresa fills Arturo with hope while dating Mariano and eventually getting engaged with him. However, she breaks up with Mariano after seeing that he will take a long time to become rich and tells him that she is going to marry Arturo. This destroys Mariano's hope, and he finds solace in Aida's arms after Paulo dies of a drug overdose days before their wedding. At first, Mariano cannot get Teresa out of his head, and he constantly begs her to leave Arturo, but her ambitions keeps her with him. Arturo and Teresa travel to Cancun, and this opens Mariano's eyes, seeing the real Teresa. Teresa marries Arturo. Before this, Teresa met Fernando, Luisa's multimillionaire fiancé and Arturo's best friend. However, their marriage fails because of Arturo's jealousy of Mariano and Teresa's constant thinking of the latter, and Arturo is unfaithful to Teresa with his ex-fiancée Paloma, who discovered Teresa's earlier unfaithfulness with Mariano and dies before she could tell Arturo, Teresa finds out Arturo's secret and almost divorces Arturo. However, Arturo takes her to their belated honeymoon in Europe, and despite her efforts and her constantly thinking of Mariano, Teresa eventually falls in love with Arturo. Time passes and Arturo finds out that Teresa and Mariano made love the day before Arturo's wedding with Teresa, and that she only married him for his money. Arturo is then thrown into an economic crisis, and doubting the love of Teresa, decides to test her love and takes her to live in the same neighbourhood that she originated from. Tired of the economic crisis, Teresa seeks to improve their status and socio-economic position by seducing Fernando. Mariano finds out and tells Luisa about Teresa's attempt to conquer Fernando's heart, and he openly admits that he's in love with Teresa, breaking off their engagement days before their wedding. Heartbroken, Luisa slowly overcomes her pain and accepts Fernando's decision without any resentment and soon finds that she's pregnant with Fernando's child, through she makes it clear she doesn't want anything with him. Armando, Teresa's father, also finds out about his daughter's actions and, disappointed he dies of a