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.

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.