After the mysterious murder of the Spanish ambassador in Lisbon, Teresa follows a lead to a young girls’ academy in Seville. Teresa decides to pose as a teacher and applies for a place at the academy.

Rumors about Teresa are beginning to spread as she resembles the suspect in the murder of the Spanish ambassador in Lisbon. Meanwhile, the academy is involved in a crisis forcing Manuela and Luisa to compete for the principal position.

Ángela goes with her family to take a portrait and meets Paula, an artist who awakens unknown feelings in her. Teresa meets an old acquaintance from Lisbon. Though her punishment is lifted, Roberta does not want to attend the Autumn Ball.

Teachers discover that students are receiving erotic literature. Luisa starts teaching sex-ed and accepts help from Teresa. Meanwhile, Roberta receives a mysterious letter.

A photo of Roberta causes rifts between her classmates. Macarena attacks another student, leading to severe consequences. Teresa questions Roberta about what happened between her and Rafita at the party on the farm.

Manuela subjects students to an aptitude test. Teresa must deal with Roberta’s departure as Luisa is worried about Arcadio beginning a romantic relationship with one of the students of the academy, María Jesús.

Manuela doubts her life with Martín, who wants a child. Roberta wants to report Rafita to the authorities. Tomás asks Flavia for one last night together before her wedding. Ángela experiences a sweet moment with Paula.

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Roberta's trial is underway. While the academy is willing to support her, the parents protest the involvement. Tomás struggles with his own feelings as he holds the key to the verdict.

Teresa stays at the academy alone over the holidays. Macarena confesses she knows that Ángela is having an affair and a small altercation arises. Flavia discovers that Tomás has been disowned by his own family.

A sad event emotionally disrupts everyone's life at the academy. Luisa is uncomfortable with Arcadio's pressure to sell the house. Ramón wants to impress Teresa on their first date. Ángela suffers in silence after David and his children abandon her.

Due to a trip to Madrid, Manuela leaves the academy in Luisa's hands, who asks Doña Manuela to help her and revive an old tradition: the Capsule. Roberta tries to contact her parents while Flavia tries to hide her feelings for Tomás.

With Ramón’s help, Teresa discovers the connection between her father and Roberta's. Students are revolutionized with cosmetics, using lipstick to feel more beautiful, except for María Jesús. Macarena feels bad for Ángela.

Teresa continues to unravel the investigation when a mysterious note makes her flee. As the end of the semester approaches, the academy faces a serious economic crisis.

After spending four months in jail, Teresa is declared innocent of the murder of her own father and is released from prison, but the teacher is not the same as before: she is exhausted after her time in prison and has no strength to face her relationship with Roberta, his sister.

Teresa moves to a little house in Seville and gives Carmen, the new administrator, her room. Carmen’s first attempt at trimming the budget does not go over well with the students.

The Academy prepares for a visit from the actor Benito Padilla, Manuela's cousin, and the director Jorge Merlot. Meanwhile, Roberta tries to get closer to Teresa and Carmen continues to pass information about the Academy to the Peraltas.

Since Teresa has returned, neither students nor teachers understand her. Roberta tries to go to Teresa for help, but she is distracted by Ines. Meanwhile, the girls propose that the Academy's street name be changed to that of a woman.

Carnival is approaching and everyone begins to prepare enthusiastically for the event at the Academy. Meanwhile, Teresa still doesn't know how to approach Roberta and Flavia is torn up over her pregnancy.

The archery competition is approaching and the competitors from Madrid arrive at the academy. To everyone's surprise, Angela is accompanying them. Flavia visits the doctor. Teresa and Roberta try to adapt to their new relationship.

Upset with Vicente, Luisa receives an unexpected visit: her son, Arcadio, and Catalina, his fiancée – a lady Luisa’s age. Arcadio wants to reconcile with his mother and make up for lost time, but the science teacher doesn't know what to think or do about it.

The Academy closes its doors and Manuela feels terribly powerless. The Peraltas claim the school as theirs and have the documents to confirm it. Teresa, however, will not let Manuela sink with the school.