After his nephew humiliates him with a mere 8,000 yuan and kicks him out, veteran mechanic Lu Zhenyuan takes his son, who was laid off on the same day, and takes over a dilapidated factory on the verge of bankruptcy. Relying on nothing but his keen ears and a wrench, he coaxes a discarded machine tool into producing music as beautiful as heavenly sounds. When his former employer urgently begs for help, he coldly refuses: If you want me back, crawl on your knees and kowtow every three steps. The counterattack begins in a heap of scrap metal.