Heo Sung-tae is Director Yong's eldest son and Heo Hyun Tae's older brother.
He's a politician.
Appearances
Inspector Koo
Guest cast, played by Choi Dae Chul
- Episode 1x05: Episode 5 (Nov 13, 2021)
- Episode 1x08: Episode 8 (Nov 21, 2021)
- Episode 1x09: Episode 9 (Dec 4, 2021)
- Episode 1x10: Episode 10 (Dec 5, 2021)
- Episode 1x11: Episode 11 (Dec 11, 2021)
- Episode 1x12: Episode 12 (Dec 12, 2021)