Oh Tae Shik, rather, Oh Kyeon Shik, who has been preparing to become a detective while working a different job, is a private establishment security guard who earns 880,000 won in Daechi Dong, Gangnam. Thanks to his dream of becoming a detective, he is like a bulldozer who does not know how to give up. He always watched CSI and Detective Columbo's movies, analyzing their traits and building his dream of becoming a great detective. He manages to pass the written test, but he doesn't meet the hearing baseline and fails. Then one day, coincidence happens and a fugitive on the run gets caught by Kyeon Shik when he throws a bottle of water he just bought at the runner. Kyeon Shik becomes a hero thanks to this.
Unfortunately the movie Intern Detective is not yet available on HBO Max.
| Writing | Kim Hyun-kyu | Writer |
| Production | Jeong Tae-sung | Producer |
| Directing | Yoon Yeo-chang | Director |
| Writing | Jeong Tae-sung | Writer |
| Writing | Yoo-kang Seo-ae | Writer |
