- Title: 나쁜 형사 / Nappeun Hyeongsa
- Also known as: Bad Detective
- Genre: Drama, psychological, crime
- Episodes: 32
- Broadcast network: MBC
- Broadcast period: 2018-Dec-03 to 2019-Jan-29
- Air time: Monday & Tuesday 22:00 (2 episodes back-to-back)
- Original Soundtrack: Less than Evil OST
Woo Tae Suk (Shin Ha Kyun) is an experienced and well-established detective with a long professional career, but in spite of everything he is a lonely and bitter human being. It all has to do with him only focusing on solving cases, while his actions are completely controversial because it crosses the line between good and evil. Woo Tae Suk crosses paths with a psychopath, but he cannot arrest her because of lack of evidence. The woman eventually decides to help Woo Tae Suk solve other cases.
- Main Cast
- Serious & Serial Team
- Cheongin Provincial Office
- Tae Suk's family
See Less than Evil/Episode Ratings
- 2018 37th MBC Drama Awards
- Top Excellence Award for an Actor in a Monday-Tuesday Drama (Shin Ha Kyun)
- Best New Actress (Lee Sul)
- It was initially titled "Luther" (루터) during the planning stages.
- It is a South Korean remake of the BBC TV series Luther (2010-present).
- Actress Lee Sul was selected for her role after competing in open auditions with 300 other applicants.
- The first script reading took place in early September 2018.