Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.
Is I Saw the Devil on Netflix? Yes! The movie I Saw the Devil is now on Netflix in the countries listed below.
| Visual Effects | Kang Jong-ik | VFX Supervisor |
| Visual Effects | Jung Do-ahn | Special Effects Supervisor |
| Art | Jeon Sung-ho | Set Decoration |
| Crew | Han Jeong-uk | Stunts |
| Sound | Kim Kyung-tae | Production Sound Mixer |
| Writing | Park Hoon-jung | Screenplay |
| Camera | Lee Mo-gae | Director of Photography |
| Sound | Mowg | Original Music Composer |
| Lighting | Oh Seung-chul | Gaffer |
| Editing | Nam Na-young | Editor |
| Crew | Lee Hee Kyung | Special Effects |
| Writing | Lee Yoon-ho | Storyboard |
| Editing | Kim Hyung-seok | Digital Colorist |
| Camera | Lee Jong-woo | Camera Operator |
| Visual Effects | Yang Il-seok | VFX Supervisor |
| Visual Effects | Son Seung-hyeon | VFX Supervisor |
| Camera | Lee Jae-hyeok | Still Photographer |
| Directing | Kim Jee-woon | Director |
| Writing | Kim Jee-woon | Screenplay |
| Art | Jo Hwa-seong | Production Design |
| Costume & Make-Up | Kwak Tae-yong | Makeup Effects Designer |
| Costume & Make-Up | Lee Hee-eun | Makeup Effects Designer |
| Sound | Romain Bigorgne | Sound Effects Editor |
| Sound | Choi Tae-young | Supervising Sound Editor |
| Sound | Choi Tae-young | Sound Re-Recording Mixer |
| Sound | Dong-Han Kim | Sound Effects Editor |
| Sound | Park Yong-gi | Sound Re-Recording Mixer |
| Crew | Jung Doo-hong | Fight Choreographer |
| Camera | Kim Byung-seo | Camera Operator |
| Sound | Gang Hye-yeong | Sound Editor |
| Directing | Seok Min-u | Assistant Director |
| Art | Son Min-jeong | Conceptual Design |
| Costume & Make-Up | Kim Hyun-jung | Makeup & Hair |
| Costume & Make-Up | Kwon Yoo-jin | Costume Design |
| Editing | Kim Mi-young | Editor |
| Art | Kim Byung-han | Conceptual Design |
| Production | Kim Jae-young | Producer |
| Production | Kim Jung-hwa | Producer |
| Production | Cho Seong-won | Co-Executive Producer |
| Production | Kim Hyun-woo | Executive Producer |
| Production | Nam Seong-ho | Line Producer |
| Art | Kim Cho-hea | Set Decoration |
| Crew | Heo Myeong-haeng | Fight Choreographer |
| Visual Effects | Jung Sung-jin | Visual Effects Supervisor |
| Costume & Make-Up | Pi Dae-seong | Special Effects Makeup Artist |
