- Kim Sung Kyun
- Â Park Bum-gu 12 episodes, 2021-2023
- Son Suk-ku
- Â Im Ji-sup 12 episodes, 2021-2023
- Jung Hae-in
- Â Ahn Joon-ho / ... 12 episodes, 2021-2023
- Koo Kyo-hwan
- Â Han Ho-yul / ... 12 episodes, 2021-2023
- Cho Hyun-chul
- Â Cho Seok Bong 12 episodes, 2021-2023
- Kim Beom-soo
- Â Kim Il-seok 12 episodes, 2021-2023
- Park Se-joon
- Â Heo Gi Yeong 12 episodes, 2021-2023
- Ewan Chung
- Â Cho Suk-bong 9 episodes, 2021-2023
- Moon Sang-hoon
- Â Kim Ru Ri 8 episodes, 2021-2023
- Lee Seol
- Â Shin Hye-yeon 8 episodes, 2021-2023
- Go Kyung-pyo
- Â Park Sung Woo 7 episodes, 2021-2023
- Lee Yeon
- Â Ahn Soo Jin 7 episodes, 2021-2023
- Shin Seung-ho
- Â Hwang Jang-soo 7 episodes, 2021-2023
- James Tang
- Â Additional Cast 6 episodes, 2021
- Harrison Xu
- Â Ryu Yi-Kang 6 episodes, 2021
- Hong Kyung
- Â Ryu Yi Kang 6 episodes, 2021
- Dylan J. Locke
- Â Kang Byeong Su 6 episodes, 2021
- Hwang Sung-bin
- Â Hwang Yeong-doo 6 episodes, 2021
- Ji Jin-hee
- Â Goo Ja-woon 6 episodes, 2023
- Yoo Su-bin
- Â Park Se Woong 6 episodes, 2023
- Jung Suk-yong
- Â Oh Min Woo 6 episodes, 2023
- Kim Ji-Hyeon
- Â Seo Eun 6 episodes, 2023
- Lee Kyu-hoi
- Â Yang Du Gwan 6 episodes, 2023
- Kim Dong-young
- Â Choi Jun Mok 3 episodes, 2021-2023
- Park Jung-woo
- Â Sin Woo-seok 3 episodes, 2021-2023
- Won Ji-an
- Â Mun Yeong Ok (Hyun Min's girlfriend) 2 episodes, 2021-2023
- Lee Jun-young
- Â Jung Hyun-min (Deserter) 2 episodes, 2021-2023
- Will Choi
- Â Shin Woo-suk 2 episodes, 2021
- Roh Jae-won
- Â Min-woo's investigator 2 episodes, 2023
- Choi Hyun-wook
- Â Shin Ah Wi 2 episodes, 2023
- Im Sung-jae
- Â Na Joong Seok 2 episodes, 2023
- Yang Mal-bok
- Â Hyeong Beom's mother 2 episodes, 2023
- Hwang Jung-min
- Â Ru Ri's mother 2 episodes, 2023
- Park Mi-hyeon
- Â Joon-ho's mother 2 episodes, 2023
- Feodor Chin
- Â Park Bum-gu 1 episode, 2021
- Na Chul
- Â Detective Na 1 episode, 2021
- Grace Power
- Â Yeong Ok 1 episode, 2021
- Choi Joon-Young
- Â Heo Chi-do 1 episode, 2021
- Jeff Bee
- Â Hyeon-min 1 episode, 2021
- Heo Ji-na
- Â Holic Bar Manager 1 episode, 2021
- Ren Hanami
- Â Chi-Do's Grandmother 1 episode, 2023
- Chase Yi
- Â Male Judge #1 1 episode, 2023
- Kwon Hae-hyo
- Â Ahn Tae Hyung 1 episode, 2023
- Woo-jung Lee
- Â Nurse 1 episode, 2023
- Davis Noir
- Â Broker 1 episode, 2023
- Im Su-hyung
- Â Detective 1 episode, 2023
- Kim Geon
- Â Du Gwan's son 1 episode, 2023
- Bae Na-Ra
- Â Jang Seong Min / ... 1 episode, 2023
- Yoon Dae-yeol
- Â Broker 1 episode, 2023
- Lee Ja-ryeong
- Â Du Gwan's wife 1 episode, 2023
