Season 1
- 1Episode 130 Aug 2021
- 2Episode 26 Sep 2021
- 3Episode 313 Sep 2021
- 4Episode 420 Sep 2021
- 5Episode 527 Sep 2021
- 6Episode 64 Oct 2021
- 7Episode 711 Oct 2021
- 8Episode 818 Oct 2021
- 9Episode 925 Oct 2021
- 10Episode 101 Nov 2021
This is the story of four police interns from Noryangjin who failed the exams and became known as F4 (the letter "F" means "failure"), as well as the various situations they face in pursuit of criminals.