The narrative revolves around an enigmatic taxi service that seeks retribution for those who cannot find justice through legal means. Kim Do Ki, a driver with a shadowy past, works for this taxi company after his mother was killed. Kang Ha Na is a dedicated lawyer, and Go Eun is an IT expert, often seen as a hacker by others. Together with Kim Do Ki, she collaborates with the Rainbow Taxi Company to address and resolve people’s issues.