Veteran welder Chen Shouyi's apprentice stole his process and misappropriated his welding stamp, and he was also framed by the factory management to take the blame for a three-million-yuan return accident. After leaving his job, he and his wife started over from a small workshop. With the help of a quality inspector and old workmates, they uncovered the dark secrets of counterfeiting with solid technology and complete evidence, ultimately winning a thirty-million-yuan order and re-establishing the industry rule of 'whoever welds is responsible'.