Medvirkende i Inspector Koo
Kim Hye-junSong Yi-kyung / "K" Kim Hae-sookDirector Yong Cho Hyun-chulOh Gyeong-su Jeong Jong-junJe-hui's father Bae Hae-seonJung Jeong-yeon Choi Young-junJang Seong-u Choi Dae-chulHeo Seong-tae Park Ye-yeongYoon Jae-yeong Jeon Seok-chan[Detective] Ahn Ryeo-jinEscort (Eps 1, 2) Park Ye-niYi-kyung's mother Jeong Yoon-heeNa Je-Hui's Colleague (Eps 8) 
