- Lee Jong-suk
- Â Park Chang-ho 16 episodes, 2022
- Im Yoon-ah
- Â Ko Mi-ho 16 episodes, 2022
- Kim Joo-hun
- Â Choi Do-ha 16 episodes, 2022
- Yang Kyung-won
- Â Gong Ji-hoon 16 episodes, 2022
- Ok Ja-yeon
- Â Hyun Ju-hee 16 episodes, 2022
- Lee Ki-young
- Â Ko Gi-kwang / ... 16 episodes, 2022
- Kim Jung-hyun
- Â Jung Chae-bong 16 episodes, 2022
- Lee Yoo-Joon
- Â Dr. Han Jae-ho 16 episodes, 2022
- Oh Ryoong
- Â Lee Doo-geun 16 episodes, 2022
- Oh Eui-Sik
- Â Kim Soon-tae / ... 16 episodes, 2022
- Kim Dong-won
- Â Gan Soo-cheol 16 episodes, 2022
- Victoria Grace
- Â Ashley / ... 16 episodes, 2022
- Ren Hanami
- Â Miyeong 16 episodes, 2022
- John Choi
- Â Soon-Tae 16 episodes, 2022
- Christian Banas
- Â Jerry 16 episodes, 2022
- Jung Jae-sung
- Â Park Yoon-gab / ... 15 episodes, 2022
- Song Kyeong-cheol
- Â Chun-sik Yang / ... 15 episodes, 2022
- Kwak Dong-yeon
- Â Jerry Oh Jin-chul 14 episodes, 2022
- Jang Hyuk-jin
- Â Choi Joong-rak / ... 14 episodes, 2022
- Song Ha-rim
- Â Inmate 7941 at Gucheon Prison 14 episodes, 2022
- Lee Ho-won
- Â Inmate 5710 at Gucheon Prison 14 episodes, 2022
- Lee Jung-hoon
- Â Inmate 8450 at Gucheon Prison 14 episodes, 2022
- Feodor Chin
- Â Park Yoon-gab / ... 14 episodes, 2022
- Hyung-Wook Yang
- Â No Park / ... 13 episodes, 2022
- Kim Seon-hwa
- Â Park Mi-young / ... 13 episodes, 2022
- Keisuke Hoashi
- Â No Park 13 episodes, 2022
- Kristian Eros
- Â Additional 12 episodes, 2022
- Kim Kyu-Seon
- Â Ashley Kim / ... 11 episodes, 2022
- Yoo Tae-Joo
- Â Psychopath at Prison / ... 10 episodes, 2022
- Han Dong-ho
- Â Choi Do-ha's Assistant / ... 10 episodes, 2022
- Lee Seung-hyeong
- Â Cha Dae-hwan / ... 10 episodes, 2022
- Jeon Gook-hwan
- Â Kang Sung-geun / ... 9 episodes, 2022
- Yoon Seok-hyun
- Â Cha Seung-tae / ... 9 episodes, 2022
- Park Se-hyun
- Â Jang Hee-joo / ... 9 episodes, 2022
- Jin Yong-wook
- Â Inmate 2718 at Gucheon Prison 9 episodes, 2022
- Yool-woo Seon
- Â Inmate 2007 at Gucheon Prison 9 episodes, 2022
- Hong Joo-hyung
- Â Inmate 4302 at Gucheon Prison 9 episodes, 2022
- Lee Joon-Gyu
- Â Inmate 8324 at Gucheon Prison 9 episodes, 2022
- Dustin Vuong Nguyen
- Â Four-Point-Seven 9 episodes, 2022
- Hong Ji-hee
- Â Jang Hye-jin (Han Jae-ho's Wife) 8 episodes, 2022
- Park Hoon
- Â Prof. Seo Jae-yong 7 episodes, 2022
- Lee Sang-kyung
- Â Waitress at Charles Hotel 4 episodes, 2022
- Jamie Snowden
- Â Additional Voices 4 episodes, 2022
- Kim Mi-ra
- Â Kim Kyung-sook / ... 3 episodes, 2022
- Lee Seo-an
- Â Cha Seung-tae's Wife 3 episodes, 2022
- Park Jung-bok
- Â Go Tae-sik / ... 3 episodes, 2022
- Woong Heo
- Â Suicider Inmate at Prison 3 episodes, 2022
- Jin Mo
- Â Suicider Inmate at Prison 3 episodes, 2022
- Min Ku-kyung
- Â Dr. Hong Kwang-ho 3 episodes, 2022
- Shin Duk-ho
- Â Security Head at GU Hospital 3 episodes, 2022
- Ma Jung-pil
- Â Doctor at GU Hospital 3 episodes, 2022
- Lee Ho-jung
- Â Psychopath's Sister 3 episodes, 2022
- Lee Hyoung-hoon
- Â Psychopath's Brother 3 episodes, 2022
- Ki Eun-Yoo
- Â Cho Sung-hyun 3 episodes, 2022
- Bae Ho-geun
- Â News Producer at Mental Nation TV 2 episodes, 2022
- Shin Seung-hwan
- Â Peter Hong 2 episodes, 2022
- Lee Young-jin
- Â Choi Man-ho / ... 2 episodes, 2022
- Han Gi-Joong
- Â Kim Gab-joo / ... 2 episodes, 2022
- Park Kwang-jae
- Â Staff at Jiseong Mental Center 2 episodes, 2022
- Han Dong-kyu
- Â Fish Farm Owner / ... 2 episodes, 2022
- Kim Gun-ho
- Â TV Debate Producer 2 episodes, 2022
- Shin Dong-eun
- Â Prison Doctor 2 episodes, 2022
- Kim Kyung-min
- Â TV Debate Moderator 2 episodes, 2022
- Joon-ho Jang
- Â Judge at Seo Jae-yong Murder Case 2 episodes, 2022
- Jang Eui-don
- Â Big Mouse Organisation / ... 2 episodes, 2022
- Jung Hyung-suk
- Â Big Mouse Organisation / ... 2 episodes, 2022
- Cha Si-won
- Â Han Yeon-sung / ... 2 episodes, 2022
- Jeon Jae-Hong
- Â Prison Security Guard 2 episodes, 2022
- Park No-kyeong
- Â Inmate 2357 at Gucheon Prison 2 episodes, 2022
- Kyu-Seop Lee
- Â Inmate 5161 at Gucheon Prison 2 episodes, 2022
- Jung Jae-jin
- Â Mr. Choi 2 episodes, 2022
- Chang-jik Lee
- Â Cho Hae-soo 2 episodes, 2022
- Hwang In-joon
- Â Min Byung-nam 2 episodes, 2022
- Lee Byeong-cheol
- Â Chang-ho's Angry Client 2 episodes, 2022
- Shin Seung-yong
- Â Chang-ho's Angry Client 2 episodes, 2022
- Kim Ki-ryung
- Â Chang-ho's Angry Client 2 episodes, 2022
- June Yoon
- Â Doha's Grandfather / ... 2 episodes, 2022
- Lee Taek-geun
- Â Gong Ji-hoon's Secretary 1 episode, 2022
- Jung Dong-geun
- Â Prosecutor in Cryptocurrency Fraud Case 1 episode, 2022
- Kim O-bok
- Â Defence Attorney for Cryptocurrency Fraud Case 1 episode, 2022
- Yoon Kwan-woo
- Â Court Employee at Cryptocurrency Fraud Case 1 episode, 2022
- Park Yong
- Â Judge for Cryptocurrency Fraud Case 1 episode, 2022
- Park Sang-jong
- Â Attorney / ... 1 episode, 2022
- Kim Do-hyung
- Â Attorney / ... 1 episode, 2022
- Yoo Su-bin
- Â Chang-ho's Upstairs Neighbour 1 episode, 2022
- Kim Do-wan
- Â Chang-ho's Upstairs Neighbour 1 episode, 2022
- Kwon Ban-suk
- Â Reporter at Chang-ho's Press Conference 1 episode, 2022
- Jang In-ho
- Â Police Detective at Hospital 1 episode, 2022
- Seo Myeong-chan
- Â Gong Ji-hoon's Butler 1 episode, 2022
- Oh Ki-hwan
- Â Traffic Police Officer in GU Hospital 1 episode, 2022
- Kim Si-young
- Â Doctor at GU Hospital 1 episode, 2022
- Pyo Young-seo
- Â Jerry's Sister 1 episode, 2022
- Na-ra Sin
- Â Traffic Police Officer at Road Block 1 episode, 2022
- Kim Kwon
- Â Reporter at Court House 1 episode, 2022
- Lee Jae-woo
- Â Reporter at Court House 1 episode, 2022
- Sung Nak-Kyung
- Â Park Yoon-Gab's Assistant 1 episode, 2022
- Park Ji-ho
- Â Reporter at Court House 1 episode, 2022
- Kim Bum-suk
- Â Police Detective at Prison 1 episode, 2022
- Park Young-bok
- Â Fish Farm Manager / ... 1 episode, 2022
- Kim Won-suk
- Â Police Detective at Prison 1 episode, 2022
- Shin Yong-jin
- Â Doctor at Nine Hospital 1 episode, 2022
- Shim Yeong-Min
- Â Dr. No Joong-sung / ... 1 episode, 2022
- Lee Dong-kyu
- Â Radio Program Host 1 episode, 2022
- Kim Si-kook
- Â Jung Chae-bong's Assistant 1 episode, 2022
- Yoon Hwan
- Â Lee Doo-geun's Assistant 1 episode, 2022
- Hong Suk-bin
- Â Man at Youngsan Reservoir 1 episode, 2022
- Min Eung-shik
- Â Judge at Choi Do-ha Case 1 episode, 2022
- Lee Yoon Sang
- Â Judge in Park Chang-ho Case 1 episode, 2022
- Jung Hyun-woo
- Â TV Reporter 1 episode, 2022
- Baek Seung-ik
- Â Waterfowl 1 episode, 2022
- Oh Min-jung
- Â Nurse at Green Narae Nursing Home 1 episode, 2022
- Lim Yong-soon
- Â Owner of Charles Hotel 1 episode, 2022
- Park Sang-hyun
- Â Nurse at Emergency Ward 1 episode, 2022
- Min Sang-woo
- Â Prison Security Guard 1 episode, 2022
- Lee Jang-ho
- Â Bae Tae-young / ... 1 episode, 2022
- Joong-don Kim
- Â Hwang Ji-hyuk / ... 1 episode, 2022
- Han Sa-myung
- Â Inmate 1708 at Gucheon Prison 1 episode, 2022
- Choi Yoon-bin
- Â Inmate 6205 at Gucheon Prison 1 episode, 2022
- Lee Kun Goo
- Â Inmate at Gucheon Prison 1 episode, 2022
- Sung-Won Jun
- Â Inmate 3857 at Gucheon Prison 1 episode, 2022
- Moon Sung-bok
- Â Inmate 4849 at Gucheon Prison 1 episode, 2022
- Mi Seok
- Â Inmate 2093 at Gucheon Prison 1 episode, 2022
- Jin Tae-yeon
- Â Club Waitress 1 episode, 2022
- Woo Hyun-seo
- Â Club Waitress 1 episode, 2022
- Goo Si-Yeon
- Â Patient 704's Relative 1 episode, 2022
- Lee Seung-joon
- Â Patient 704's Relative 1 episode, 2022
- Park Hee-eun
- Â Patient 704's Wife 1 episode, 2022
- Lee Hyeon-geol
- Â Riot Officer at Gucheon Prison 1 episode, 2022
- Kim Min
- Â Student at Police Station 1 episode, 2022
- Lee Yoon-sang
- Â Kid Gong Ji-Hoon 1 episode, 2022
- Park Sang-hwi
- Â Press Reporter 1 episode, 2022
- Kim Sa-Hoon
- Â Press Reporter 1 episode, 2022
- Lim Seung-beom
- Â Press Reporter 1 episode, 2022
- Park Hyo-bin
- Â Press Reporter 1 episode, 2022
- Im Jae-Geun
- Â Press Reporter 1 episode, 2022
