Kang Jin-hyuk (1 episode)

Jeon Suwon

Ro-han

Seo Min-ki (8 episodes)

Seo Min Gi (8 episodes)

Jeon Woo-seok

Je-a

Jungsik

Self (1 episode)

(1 episode)

Do Gun-tae

Cho Byung-kyu (1 episode)

Self (4 episodes)

So Mun (28 episodes)

Hang-nam

(1 episode)

Han Jae Hee (16 episodes)

(10 episodes)

Satenik (3 episodes)

Self (2 episodes)

Youngest Detective

Johan

Kang Sung Mo (young) (16 episodes)

Go Woo-chul

Cha Gi-jun (20 episodes)

김종일

Kim Jong-il (20 episodes)

Kim Bok-Kyu (32 episodes)

Dong-hoon

Ko Hoon-Jung (16 episodes)

young Pil-Joo (24 episodes)

Lee Bong-Soo (8 episodes)

Cho Chung-hwan (4 episodes)

Baek Seok-hee (20 episodes)

Cafe Part-timer (1 episode)

Kim Min-Joong (12 episodes)