Hang in There, Kids! 2016 one on netflix

In a secluded indigenous tribe, 3 kids who grew up in the mountains and the woods. They are all very optimistic, energetic and playful; yet, they are also troubled by their own family issues. Their handicapped teacher opened an after school session to help them with their schoolwork. For the children, it’s like a ray of love shone on them. The teacher has a beautiful voice, but never sings. One day, the 3 kids find a tape of their teacher’s recording and are amazed by her voice. They decide to bring this tape to Taipei…. What changes will this trip bring to all of their lives?