The discovery of counterfeit RMB banknotes in Ji'an City has seriously damaged and affected the financial order and had a major impact on the economic development of Ji'an City. The counterfeit banknotes were identified as the latest counterfeit banknote templates developed abroad. The Public Security Bureau Director Zhang Zhiqing ordered the immediate establishment of a special case team and named the action "Iron Fist Operation" after obtaining the consent of the Municipal Party Committee, and the templates were investigated and confiscated within a limited time. Du Xiongfei, the captain of the major case team, led Li Yong, Huang Yan and other police officers to cooperate with Liao Bin inside and outside, and fought wits and courage with criminals Zhang Dali, Gu Baosen and others. After layers of unraveling, they finally successfully cracked the shocking case of counterfeiting and selling banknotes, maintaining the financial order of Ji'an City and the people's living conditions.