Drama Voice Season 4 ini mengusung genre action, misteri, dan thriller, drama yang ceritanya fokus pada kisah Kang Kwon-Joo (Lee Ha-Na), direktur karismatik Pusat Laporan Kejahatan yang menderita PTSD sejak kehilangan dua mitranya selama misi sebelumnya. Ia akan bekerja sama dengan Derek Jo, detektif sekaligus leader dari LAPD (Los Angeles Police Department) yang menangani geng kriminal.
Keduanya mengejar pelaku pembunuhan berantai dengan bermodalkan kemampuan pendengaran tajam spesial yang dimiliki Kang Kwon Joo dan kerjasama apik bersama pusat panggilan darurat dan detektif ulung.
Judul : Voice 4: Judgment Hour (2021)
Judul Lain : Voice Season 4, Voice S4, Voice 4: Time of Judgment, Boiseu Sijeun 4, Boiseu 4: Simpanui Sigan, ë³´ì´ìŠ¤ 시즌 4
Hangul : ë³´ì´ìŠ¤ 4: ì‹¬íŒ ì˜ ì‹œê°„
Genre : Aksi, Thriller, Misteri, Psikologis, Kriminal, Detektif
Perusahaan Produksi: Studio Dragon, Voice Production
Sutradara: Shin Yong Hwi
Penulis Naskah: Ma Jin Won
Episode : 14 (Akan Dikonfirmasi)
Jaringan Siaran : tvN & OCN
Periode Penyiaran : 18 Juni 2021 – 31 Juli 2021
Runtime : Jumat & Sabtu 22:50 (KST)
Bahasa: Korea
Negara: Korea Selatan
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| Song Seung-Heon | Lee Ha-Na |
| Derek Cho | Kang Kwon-Joo |
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| Son Eun-Seo | Kang Seung-Yoon | Kim Joong-Ki | Song Boo-Gun | Baek Sung-Hyun |
| Park Eun-Soo | Han Woo-Joo | Park Joong-Ki | Goo Gwang-Soo | Shim Dae-Sik |
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| Han Gab-Soo | Kim Pub-Lae | Kim Cheol-Yun |
| Yoo Jae-Chun | Captain Park Hyun | detective |
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| Han Jong-Hoon | Maurice | Daniel Joey Albright | John D. Michaels |
| Chad | Nick | Matt (ep.1) | captain (ep.1-2) |
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| Gil Hae-Yeon | Lee Eol | Hong Sang-Pyo | Kwon Jae-Hwan | Yang Joo-Ho |
| Commissioner Kam Jong-Sook (ep.2) | Yang Bok-Man (ep.2) | Bu Gwi-Nam (ep.2) | Cheon Sang-Pil (ep.2) | Ko Won-Ki (ep.2) |
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| Lee E-Dam |
| Lisa Cho / Cho Seung-A |
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| Moon Chang-Kil | Won Mi-Won | Cha Yoo-Hyun | Baek Seung-Chul | Oh Min-Jung |
| Joo Bum-Tae's grandfather (ep.1) | Joo Bum-Tae's grandmother (ep.1) | Lee Hyun-Min (ep.1) | Lee Hyun-Min's father (ep.1) | Gong Sook-Hee (ep.1) |
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| Woo Mi-Hwa | Shin Yeon-Woo | Choi Jae-Sup | Han Chul-Woo | Kim Joong-Hee |
| Jang Ye-Sook (ep.2) | camper (ep.2) | camper (ep.2) | Ko Deok-Hwan (ep.2) | dog owner (ep.2) |
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| Andreas Varsakopoulos | Kim Eun-Seok | Lee Joo-Sil | Kim Mi-Ra |
| Ricky Gonzalez (ep.1) | charity worker (ep.1) | Park Eun-Soo's grandmother (ep.2) | NFS examiner (ep.2) |
Additional Cast Members:
