Een depressieve oude man wordt dood gevonden in zijn huis. Zijn huishoudster wordt gearresteerd op verdenking van moord. De advocaat Soon-ho wordt aangewezen om de verdachte pro bono te verdedigen. Soon-ho is verrast dat de enige getuige van de dood van de oude man een autistische jonge tiener is. Toch wil hij haar als getuige oproepen.
Nee, helaas is 증인 nog niet beschikbaar op Netflix in Nederland.
| Lighting | Cho Hyun-chul | Lighting Artist |
| Writing | Hong Yong-ho | Adaptation |
| Art | Kim Yun-suk | Props |
| Editing | Kim Hyung-seok | Digital Intermediate |
| Sound | Ahn Bok-nam | Production Sound Mixer |
| Visual Effects | Kim Seong-hwan | VFX Supervisor |
| Camera | Cha Min-jung | Still Photographer |
| Visual Effects | 김종성 | VFX Supervisor |
| Directing | 이한 | Director |
| Writing | 이한 | Writer |
| Production | Lee Jun-u | Producer |
| Writing | Moon Ji-won | Writer |
| Camera | Lee Tae-yoon | Director of Photography |
| Editing | Nam Na-young | Editor |
| Sound | 조영욱 | Original Music Composer |
| Sound | 김석원 | Sound Supervisor |
| Production | Kim Jae-joong | Executive Producer |
| Production | Kim Woo-jae | Executive Producer |
| Production | Cha Won-chun | Executive Producer |
| Art | Kang So-yeong | Production Design |
| Costume & Make-Up | Kim Jung-won | Costume Design |
| Costume & Make-Up | Lee Seo-jin | Makeup & Hair |
| Production | Jeong Gyeong-jae | Executive Producer |
| Editing | Ha Mi-ra | Assistant Editor |
| Lighting | Oh Seung-chul | Lighting Director |
| Camera | Lee Eui-tae | Camera Operator |
