This film tells the story of the coming Children's Day. Fat people and thin people who make underground music tapes for a living are eyeing 7-year-old Guo, the lead singer of the Angel Choir, in an attempt to induce him to record a best-selling video for himself in the summer vacation. Pumbaa is a very independent and confident little man. He not only has a moving voice, but also has a happy and confident childlike innocence. Teacher Song and the children refused to work for them when they found out that they had been cheated. The fat man and the thin man tried to kidnap the children. Inspired by the slogan "Good people are not afraid of bad people", the children beat the fat and thin people with their intelligence.