In her XXY role, Efron's character is a 15-year-old intersex person trying to make a decision about her or his identity. Efron pointed out that "I liked the Alex character a lot and thought: I can do that. I felt a real connection." For her performance, Efron won the award for Best Actress at the Cartagena Film Festival as well as three other awards.
In 2009 Inés Efron starred in another of Lucía Puenzo's film called The Fish Child.