In a dystopian South Korea gripped by fury, public trust in the justice system shatters when high-profile criminals repeatedly escape severe punishment due to legal loopholes, technicalities, or wealth. Amidst this volatile climate of vigilantism, a masked figure known only as "Dog Mask" emerges online, sparking a nationwide phenomenon. Operating through an anonymous mobile application, Dog Mask initiates "The Killing Vote." This sinister democratic referendum targets heinous offenders who have evaded formal justice. Citizens aged eighteen and older receive a mysterious text message posing a single question: "Do you think [Criminal Name] deserves the death penalty?" If more than fifty percent of the electorate votes "yes," Dog Mask executes the convict, broadcasting the grim retribution live and plunging the nation into a moral crisis.The state apparatus reacts with desperation, establishing a specialized task force led by Kim Mu-chan, a fiercely ambitious, morally compromised senior inspector notorious for bending rules to achieve his goals. Joining him is Kwon Seok-joo, a former prestigious legal scholar and once-respected law professor serving a life sentence for murdering the
sexual predator who assaulted his daughter. Seok-joo possesses a chilling intellect and a deeply personal stake in the country's penal failures. Operating alongside Mu-chan is Joo Hyun, a sharp, empathetic cyber-investigator from the Seoul Metropolitan Police Agency who was demoted for whistleblowing. Unlike Mu-chan’s brute-force methods, Joo Hyun relies on meticulous digital forensics, eventually uncovering clues that point toward a massive conspiracy deeply embedded within the political and social hierarchy.As the body count rises and Dog Mask’s popularity surges into a terrifying cultural movement, the line between justice and murder blurs. The narrative delves into the complex psychological motivations driving the central trio. Mu-chan struggles with his own dark past and questionable ethics while trying to maintain order. Joo Hyun fights tirelessly to preserve the rule of law in a society intoxicated by revenge. Meanwhile, Seok-joo manipulates
the investigation from his cell, driven by lingering grief and a desire to dismantle a rotten system.The investigation ultimately exposes a vast web of corruption involving elite figures, wealthy conglomerates, and corrupt politicians who secretly control the very criminals Dog Mask targets. Betrayals mount, and shocking revelations link the origin of Dog Mask not to a single individual, but to a deeply traumatized collective of victims seeking closure. In a thrilling climax, the task force races against time to stop the final, most catastrophic vote. The series concludes by forcing the characters and the public to confront an agonizing truth: when the justice system fails completely, society itself becomes complicit in the bloody cycle of vengeance, leaving a fractured nation to rebuild upon the ashes of its own moral collapse.