The night in Seoul is dark, and the taxis of Rainbow Transport turn on their hidden lights. Jin Daoqi, who was born in the special forces, took on the hidden pain of PTSD and transformed into a versatile avenger. He teamed up with hacker An Gaoen and modification masters to seek justice for the wronged souls who could not be protected by the law. The hot-blooded prosecutor Jiang Ha-neul struggles between public power and lynching, while the team led by Zhang Shengzhe uses the sharp edge of "fighting evil with evil" to cut through the dark corners of society. Every engine roar is a desperate counterattack after justice is late.