‘Voice‘ narrates the story of a special police division team — Golden time. It is an exclusive task force group that solves urgent real-time incidents from phone calls received through the city’s emergency service line. Golden time team was formed in cooperation of the emergency call center and local police officers. Its prime responsibility is to race through the precarious time left for crime victims, who are held captive or being chased by their assailants and save them from the imminent danger.
Kang Kwon Joo and Moo Jin Hyuk lead the team. Their history goes back three years ago when Jin Hyuk’s wife was violently murdered by a serial killer and Kwon Joo’s police father who was near the site came to fulfil the police dispatch order, but ended up suffering the same fate. Kwon Joo, who has an incredible hearing prowess, listened to both murder scenes that night and vowed to avenge the death of his father. The police present the culprit, but Kwon Joo who knows the true voice of the culprit, denies that the man they caught is the true murderer. It causes a stir and headache on the police officials, who are already on a tight spot due to the public attention given to the savage killings. Kwon Joo is ordered to shut up, and even altering his father’s death cause to a hit-and-run case.
Three years later, Kwon Joo and Jin Hyuk’s path cross again. Through cases they solved in the Golden time unit, they establish trust between each other as Jin Hyuk learns of Kwon Joo’s hearing ability. She reveals to him the story of what happened the night their family members were slayed. She voices her thoughts on how someone in the police organization is covering the tracks of the main villain. As they investigate the recent serial killings, they uncover the clues to finally pin down the psychopath, who mercilessly took the lives of their loved ones and other innocent victims. When they finally solve the puzzle, they must deal with money power plays to overcome the insanely rich maniac, whose iniquities are overlooked because of his father’s powerful protection.