- Jo Woo-jin
- Â Kang Dong-woo 8 episodes, 2024
- Ji Chang-wook
- Â Yoon Gil-ho 8 episodes, 2024
- Ha Yoon-kyung
- Â Min Seo-jin 8 episodes, 2024
- Bibi
- Â Kim Jae-Hee ('Jenny') 7 episodes, 2024
- Oh Ye-ju
- Â Kang Ye-seo (Dong-woo's daughter) 6 episodes, 2024
- Hyun Bong-sik
- Â Kim Jang Ho 6 episodes, 2024
- Yuuki Luna
- Â Kang Ye Seo 6 episodes, 2024
- Jeong Man-sik
- Â Tak Joo-Il 6 episodes, 2024
- Jeong Jae-kwang
- Â MD Jeong-kwon 5 episodes, 2024
- Im Sung-jae
- Â Psyche 5 episodes, 2024
- Ryu Hye-young
- Â Seo Ji-Su 5 episodes, 2024
- Cha Rae-hyung
- Â ('K') 5 episodes, 2024
- Ok Ja-yeon
- Â Choi Soo-In 4 episodes, 2024
- Choi Kwang-il
- Â Moon Chul-Sung 4 episodes, 2024
- Kim Jong-soo
- Â Choi Hak-Gu 4 episodes, 2024
- Park So-Ri
- Â Ryu Hyeon-Kyung 4 episodes, 2024
- Lee Seo-hwan
- Â Lee Han-Pyeong (Deputy Minister of Health) 3 episodes, 2024
- Kim Byeong-Ok
- Â Woo Dae-Sik (Mayor) 3 episodes, 2024
- Jung Ga-ram
- Â Noh Jun-Seo ('Chunni') 3 episodes, 2024
- Kim Do-hyun
- Â Ju Yun 3 episodes, 2024
- Kwak Jin-seok
- Â Incineration team member 3 episodes, 2024
- Park Joo-won
- Â Lee Jung-Hwa 3 episodes, 2024
- Lim Hyun-sung
- Â Detective team leader 3 episodes, 2024
- Joo-ho Na
- Â Detective 3 episodes, 2024
- Shin Sung-Il
- Â Detective 3 episodes, 2024
- Choi Seong-Hyuk
- Â Jwipo 3 episodes, 2024
- Song Ji-woo
- Â Oh Jin-Young 2 episodes, 2024
- Seon Yu
- Â Shin Ji-Hye 2 episodes, 2024
- Ji Seung-hyun
- Â Lee Gang-Su 2 episodes, 2024
- Mark Lewis
- Â Yun 2 episodes, 2024
- Hong Shi Young
- Â ('MD Lemon') 2 episodes, 2024
- Gong Jae-Kyung
- Â Madam Baek 2 episodes, 2024
- Hwang Bo Jung Il
- Â Seong-Bin 2 episodes, 2024
- Anzu Lawson
- Â Actress 1 episode, 2024
- Jang Won-hyung
- Â Detective Jang 1 episode, 2024
- Jung Gi-sub
- Â Inspector general 1 episode, 2024
- Woo Kang-Min
- Â Detective ('FM') 1 episode, 2024
- Ahn Seong-bong
- Â Colosseum chief of security 1 episode, 2024
- Lee Seok-hyeong
- Â Choi Bu-Gi 1 episode, 2024
- Jang Eui-don
- Â Detective captain 1 episode, 2024
- Yang Ji-soo
- Â Psychiatrist 1 episode, 2024
- Yoo Dong-Hoon
- Â Dioni 1 episode, 2024
- Kwak Jin
- Â Pocheon Station chief 1 episode, 2024
- Byun Jin Soo
- Â Colosseum VIP 1 episode, 2024
