Full cast of Inspector Koo

Lee Young-ae

Koo Kyung-yi

12 episodes

Kim Hye-jun

Song Yi-kyung / "K"

12 episodes

Kim Hae-sook

Director Yong

12 episodes

Kwak Sun-young

Na Je-hui

12 episodes

Baek Sung-chul

Santa

12 episodes

Cho Hyun-chul

Oh Gyeong-su

12 episodes

Lee Hong-nae

An Geon-uk

12 episodes

Jeong Seok-yong

Mr. Kim

11 episodes

Jeong Jong-jun

Je-hui's father

9 episodes

Park Kang-seop

Lee Dae-ho

8 episodes

Bae Hae-seon

Jung Jeong-yeon

6 episodes

Choi Young-jun

Jang Seong-u

6 episodes

Park Ji-bin

Heo Hyeon-tae

6 episodes

Choi Dae-chul

Heo Seong-tae

6 episodes

Kim Kang-hyun

Kim Min-gyu

5 episodes

Park Ye-yeong

Yoon Jae-yeong

4 episodes

Kim Soo-ro

Ko Dam

4 episodes

Kim Ki-cheon

Gardener

2 episodes

Jeon Seok-chan

[Detective]

2 episodes

Ahn Ryeo-jin

Escort (Eps 1, 2)

2 episodes

Park Ye-ni

Yi-kyung's mother

1 episode

Jeong Yoon-hee

Na Je-Hui's Colleague (Eps 8)

1 episode

Han Seung-yoon

[Policeman]

1 episode