Inspector Tai On-na (Jessica Hester Hsuan) has always been comfortable in the logistic position of file management. Because of fate, he will work with the Yuanzu-level Tuoqiang senior sister Chan Sam-yuan (Joyce Tang) and the male god of the Flying Tigers team Mung Hon-sam (Moses Chan) to solve the case. (Hui Shiu Hung) arranges to join the unsettled case team, and a group of police officers with their own "characteristics", under the leadership of Hon-sam, pursue unsettled cases that are not of concern to the outside world. Hon-sam was dissatisfied with On-na and fought each other until it was revealed that Anna was afraid of using a gun because of being hijacked, and the two sparked love! On-na meets again with Lau Tat-Wah (Him Law), a tuition student who was destroyed many years ago, but he has joined the underworld... Under the impetus of feelings and guilt, can On-na get back the pistol and re-energize her, and become a new generation of "armed lady cop" ?
Inspector Tai On-na has been happily carrying out her admin duties in managing files. Fate has brought On-na, seasoned armed lady cop Chan Sam-yuen and SDU Prince Mung Hon-sam together. After some case is solved by the trio, On-na’s boss Wai Chin-chiu assigns On-na to Cold Case Special Investigation Unit. Under Hon-sam’s command, On-na and a contingent of police officers with “special characteristics” investigate cold cases that outsiders are not interested in. Hon-sam and On-na keep outwitting each other as Hon-sam is disappointed with On-na. Hon-sam eventually discovers On-na has gun phobia as she was once taken hostage, causing the two of them to fall in love. On-na again runs into Lau Tat-wah , who used to be a tutorial student. However, Tat-wah, who had the misfortune of all his family members being killed, has become a gangster. Driven by emotions and guilt, is On-na capable of regaining her confidence, holding a gun in her hand again and becoming the new iconic “armed lady cop”?