All of the male performers receive an opportunity to audition for the new teacher. Meanwhile, Mía and Juanma allow their personal feelings to affect their duet recording.
Álvaro puts together a surprise dinner for Mía. Martín schemes to get revenge on Tobí. Meanwhile, Mercedes and her friend partake in a DNA test of their own.
Someone unexpected lends Lupe a helping hand after she discovers her parents' plan to separate. Meanwhile, Mía struggles to choose between Álvaro and Juanma.
The group puts on their performance at nationals, facing off against some unexpected competition. Meanwhile, Mía, Álvaro, and Lupe must face the future.