Ji Woo, who lost her parents in an autonomous car accident during childhood, is a detective who believes in her instincts and abilities rather than relying on the force's artificial intelligence which analyzes data and runs simulations to inform what commands are sent to the officers. However, Ji Woo misses a suspect and is forced to receive a new recruit, none other than an artificial intelligence presence, Seo Nang, implanted in her brain. Ji Woo has to solve a murder case with the help of Seo Nang, but that's not as easy as it sounds. Can Ji Woo and Seo Nang make a dream team and catch the criminal?