- Drama: Voice 4
- Revised romanization: Voice 4: Simpanui Shigan
- Hangul: 보이스4: 심판의 시간
- Director: Shin Yong-Hwi
- Writer: Ma Jin-Won
- Network: tvN
- Episodes: 14
- Release Date: June 18, 2021 —
- Runtime: Friday & Saturday 22:50
- Language: Korean
- Country: South Korea
A serial killer with an enhanced hearing ability appears. The serial killer murders people using his enhanced ability. Because of this, Kang Kwon-Joo (Lee Ha-Na), who also has an enhanced hearing ability, is driven into a corner. Kang Kwon-Joo cooperates with Detective Derek Jo (Song Seung-Heon) to catch the serial killer. Derek Jo is a person of principal, who doesn’t allow mistakes. He is a team leader from the LAPD (Los Angeles Police Department). His LAPD team dealt with criminal gangs.
Meanwhile Kang Kwon-Joo has suffered from PTSD since the death of Do Kang-Woo, but she still carries out her duties as the the leader of the emergency 112 call center.