In a bank robbery, Beethoven (Cen Jianxun) and (Shi), who are known as "double guns", met Wen (Shi), an expert in scientific criminal investigation. Although their technology is different and their friendship is profound, the relationship between them has become subtle since the appearance of scientists' articles. After another jewelry robbery, the two men cooperated again, but Wen made a splash in this operation. Wen is still in trouble. His wife (played by Hu Yinmeng) and a wealthy jeweler surnamed Yang were caught on a date at the mall, which greatly stimulated him, so he took revenge. A Qiu and Beethoven made a difficult choice between law and friendship. In order to protect the dignity of the expert, Wen decided to punish jeweler Yang, so he drove his beloved sheep to compete with jeweler Yang's expensive sports car for parking spaces. Unexpectedly, he was knocked down and the sheep was crushed into scrap iron. Wen was greatly stimulated, and Qiu and Fen happened to pass by. Hearing this, Wen was relieved and benefited greatly, so he invited them to have dinner together.