Under the leadership of female cadre Luo Yingwei, three young female police officers from the Archives of Pingling Public Security Bureau, namely Cai Wenxin, Xia Luoyang, and Feng Yi, formed a case solving team with astonishing conditions. With the trust and help of Cai Wenxin's brother, Cai Wenfei, the captain of the Criminal Police Brigade of Pingling Public Security Bureau, and other seniors, the team members overcame countless difficulties, solved several cold cases, and also destroyed Pingling's drug trafficking group. In this process, they understood the significance of being police officers and ultimately grew into excellent police officers.