Can a dangerous serial killer be brought to justice? Moo Jin Hyuk (Jang Hyuk) is an ace detective whose world falls apart when a serial killer kills his wife (Cha Soo Yeon). Kang Kwon Joo (Lee Ha Na) is a top graduate of the police academy who starts work as a 112 call center operator. When a call of a brutal murder taking place comes in, Kwon Joo ends up overhearing the killing of her own father, who is a police sergeant called to the scene of the crime. Devastated, Kwon Joo goes to the United States to further her studies and returns to Korea as a criminal voice profiler. Working together, can Jin Hyuk and Kwon Joo track down the same serial killer responsible for the loss of their loved ones? “Voice” is a 2017 South Korean drama series directed by Kim Hong Sun.