The Rainbow Deluxe Taxi is back in business. Although the crew disbands after Do-ki's successful revenge, Sung-cheol, Go-eun, Gyeong-gu, and Jin-eon couldn't help but reunite with him once again. Each of them tries to live an ordinary life with an ordinary job, but it is in their nature to fight against injustice. The company also welcomes a new employee. On Ha-jun is a clumsy but kind-hearted boy who accidentally finds the secret basement of Rainbow Taxi. Fighting on behalf of everyone who has been wronged in this unequal society, the crew works for more clients than before. However, a mysterious organization is after Rainbow Taxi this time. They first show their existence by killing one of the villains Do-ki is after but goes back into hiding without giving him a chance to find out.

The story of a mysterious taxi service that takes revenge on behalf of victims who are unable to get justice from the law. Kim Do Ki is a mysterious driver for the taxi company whose mother was murdered. Kang Ha Na is a passionate attorney. Go Eun is an IT specialist, while others consider her a hacker. Along with Kim Do Ki, she works as part of Rainbow Taxi Company to solve people's problems.