Kim Ji-yong is a diligent and brilliant student at the police academy. However, during weekends, he assumes the role of a vigilante to apprehend wrongdoers who evade the reach of the law. His moves, which were given the name Vigilante by the broadcaster reporter Choi Mi-ryeo, garnered the attention and cheers of the public, and Jo Gang-ok appears, a big fan and second-generation heir of a conglomerates. In response, Jo Heon, the leader of the Metropolitan Investigation Squad, initiates a pursuit of Vigilante.
