Wu Yifan, a veteran detective who has been in the criminal police force for many years, is famous for his calm character and keen logical reasoning ability. He is used to staying alone and has an almost paranoid focus on the case. Liu Tingmei, a top student who has just graduated from the police academy, is full of energy and drive. She is proficient in modern investigative techniques, especially network tracking and data analysis, but lacks practical experience. Due to a special case assignment, the two accidentally became partners. At first, they had many differences in their handling styles and conflicts continued.
