STORY:

Besides offering rides to passengers, a group of employees at Rainbow Taxi also discreetly offers a special revenge for hire service. Kim Do-Ki (Lee Je-Hoon) leads the revenge group with Owner Jang Sung-Chul (Kim Eui-Sung), Hacker Ahn Go-Eun (Pyo Ye-Jin), Mechanic Choi Kyung-Koo (Jang Hyuk-Jin), and Mechanic Park Jin-Eon (Bae Yoo-Ram). People that have been victimized and cannot find redress through normal channels, reach out to Kim Do-Ki's group to finally receive justice.
After finishing their last mission, some members of the revenge team at Rainbow Taxi decide to go their separate ways. Kim Do-Ki remains at Rainbow Taxi with Jang Sung-Chul, but the others take on new jobs and careers. Now, 2 years later, Kim Do-Ki travels to Vietnam to help a father find his missing son, who went there for employment. As the case becomes more complicated and dangerous, Ahn Go-Eun, Choi Kyung-Koo, and Park Jin-Eon decide to return to Rainbow Taxi to do what they do best. Rainbow Taxi also has hires new employee On Ha-Joon (Shin Jae-Ha).

Selain memberi perkhidmatan pengangkutan, sekumpulan pekerja di Teksi Rainbow juga menawar perkhidmatan balas dendam khas secara upah. Kim Do-ki memimpin kumpulan balas dendam ini dengan Tuan Milik Jang Sung-chul, Penggodam Ahn Go-eun, serta Mekanik Choi Kyung-koo dan Park Jin-eon. Orang yang menjadi mangsa dan tidak dapat menebus rugi melalui saluran biasa, mencari kumpulan Kim Do-ki untuk memperolehi keadilan akhirnya.
Selepas siap misi terakhir mereka, beberapa anggota pasukan balas dendam Teksi Rainbow memutus untuk ikut perjalanan masing-masing. Kim Do-ki kekal di Teksi Rainbow bersama Jang Sung-chul, tapi yang lain sudah dapat kerjaya baharu. 2 tahun kemudian, Kim Do-ki pergi ke Vietnam untuk menolong seorang si ayah menyelamatkan anaknya yang pergi sana untuk bekerja kemudian hilang diri. Bila kes ini menjadi semakin rumit dan bahaya, Ahn Go-eun, Choi Kyung-koo dan Park Jin-eon memutus untuk kembali ke Teksi Rainbow untuk bakat masing-masing. Teksi Ra