Starting at her new school, a young girl named "Zsofi" (played by Karádi Borbála) hoped to become part of the choir. She quickly made friends with "Liza," who was already a prominent member (Hais Dorottya), and attended a rehearsal. Following this, the teacher, "Miss Erika" (Szamosi Zsófia), suggested that she should simply pretend to sing in future rehearsals because her abilities weren't quite up to standard yet. Feeling disheartened, Liza soon suspected something wasn’t right and, after some effort, uncovered it. During a subsequent practice, the young “Liza” observed more than she was meant to, and with a competition approaching, the choir felt it was necessary to take action. The performances of the girls and their teacher were captivating, and I appreciated how the story concluded – it fit very nicely into this pleasant narrative about cooperation that also included a slight taste of retribution!

Source on TMDB