In 1782, King Jeong-jo of Joseon asks detective K to investigate a series of murders related to a case of corruption within the government.
Is Detective K: Secret of Virtuous Widow on Netflix? Yes! The movie Detective K: Secret of Virtuous Widow is now on Netflix in the countries listed below.
| Directing | Kim Sok-yun | Director |
| Writing | Lee Choon-hyung | Screenplay |
| Writing | Lee Nam-kyu | Screenplay |
| Production | Cho Yoon-jin | Producer |
| Sound | Kim Han-jo | Original Music Composer |
| Art | Chae Kyoung-sun | Art Direction |
| Production | Kim Jho Gwang-soo | Executive Producer |
| Costume & Make-Up | Kwon Yoo-jin | Costume Design |
| Sound | Jeong Ji-young | Sound Effects Designer |
| Writing | Kim Tak-hwan | Novel |
| Camera | Jang Nam-cheol | Director of Photography |
| Crew | Kim Tak-ho | Stunts |
| Camera | Kwak Gyeong-moo | Grip |
| Lighting | Shon Jin-seong | Lighting Director |
| Editing | Kim Sun-min | Editor |
| Sound | Uhm Gi-yeob | Original Music Composer |
| Art | Yun Il-rang | Set Decoration |
| Costume & Make-Up | Kim Yi-sook | Makeup & Hair |
| Sound | Choi Hyun-woo | Production Sound Mixer |
| Sound | Lee Seung-chul | Sound Supervisor |
| Sound | Lee Sung-jin | Sound Supervisor |
| Visual Effects | Jeon Gun-ik | Special Effects Supervisor |
| Visual Effects | Lee Seung-ho | Visual Effects |
| Directing | Uhm Dae-yong | Assistant Director |
| Editing | Kwon Yoon-gyeong | Colorist |
| Production | Lee Seon-mi | Executive Producer |
| Sound | Na Ho-yeong | Production Sound Mixer |
| Production | Jay Choi | Co-Executive Producer |
| Production | Ahn Mong-sik | Line Producer |
