Eun Shi-Yeon (Kong Hyo-Jin) is a police lieutenant. She is demoted to a hit-and-run investigation team from the regional investigation unit at the National Police Agency. At the hit-and-run investigation team, Eun Shi-Yeon works with Police Constable Seo Min-Jae (Ryoo Joon-Yeol) and Woo Sun-Young (Jeon Hye-Jin). They try to catch Jung Jae-Cheol (Cho Jung-Seok). He is the first Formula One racer in South Korea, but he suddenly retired as a race car driver. He is now businessman.