Despite disbanding after Do Gi's successful revenge, the Rainbow Deluxe Taxi crew, including Seong Cheol, Go Eun, Gyeong Gu, and Jin Eon, can't resist the call to reunite with their former leader. Though each attempts to live a regular life with a typical job, their innate desire to fight against injustice draws them back to one another. The group even welcomes a new member, a kind-hearted but clumsy young man named On Ha Jun, who stumbles upon the secret basement of Rainbow Taxi.
Now fighting for more clients than ever before, the crew continues to battle on behalf of those wronged by an unequal society. However, their work draws the attention of a mysterious organization, which makes its presence known by killing one of Do Gi's targets before disappearing without a trace. As they try to uncover the organization's identity and motives, the Rainbow Taxi crew faces their toughest challenge yet.