Choi Tae-hwan

as Yo-han

as Seo Chung-jae (16 episodes)

as Park Do-soo (16 episodes)

as Youngest detective

as Kim Chul-soo (24 episodes)

as Je-seop

as Shin Seok-hyeon (16 episodes)

as Eun Jung-Soo (32 episodes)

as Choi Min-Soo (12 episodes)

as Ma Deuk-chan (6 episodes)

as Wang Sae-son (10 episodes)

as Choi Hoon-Suk (16 episodes)

as Dae-sung

as Ho-jin (20 episodes)

as Jang Gi-chul (16 episodes)

as Lee Sang-woo (20 episodes)

as Sang Jin