- Lee Hana
- Â Kang Kwon Joo 58 episodes, 2017-2021
- Son Eun-seo
- Â Park Eun-soo 57 episodes, 2017-2021
- Song Boo-gun
- Â Gu Kwang Soo 55 episodes, 2017-2021
- Kim Joong-Ki
- Â Park Joong Ki 49 episodes, 2017-2021
- Lee Jin-wook
- Â Do Kang-woo 29 episodes, 2018-2021
- Kim Woo-Seok
- Â Jin Seo Yool 28 episodes, 2018-2021
- Baek Sung-hyun
- Â Sim Dae-sik 26 episodes, 2017-2021
- Yoo Seung-mok
- Â Na Hong-soo 26 episodes, 2018-2019
- Jang Hyuk
- Â Moo Jin Hyeok 16 episodes, 2017
- Yesung
- Â Oh Hyun Ho 16 episodes, 2017
- Lee Hae-young
- Â Jang Gyeong Hak 16 episodes, 2017-2018
- Kwon Yul
- Â Bang Je Soo 16 episodes, 2018-2019
- Song Seung-heon
- Â Derek Cho 14 episodes, 2021
- Kim Jae-Wook
- Â Mo Tae Goo 14 episodes, 2017
- Ahn Se-ha
- Â Kwak Dok Ki 14 episodes, 2018-2019
- Park Byeong-eun
- Â Kaneki Masayuki 14 episodes, 2019-2021
- Jang Hang-seon
- Â Dong Bang-heon-yeob 14 episodes, 2021
- Hyeong-joon Kwon
- Â Cheon Sang Pil 12 episodes, 2017-2021
- Han Jonghoon
- Â Chad Lee 12 episodes, 2021
- Kang Seung-yoon
- Â Han Woo Joo 10 episodes, 2021
- Lee Kyoo-hyung
- Â Dong Bang Min 9 episodes, 2021
- Maurice Turner Jr.
- Â Nick 6 episodes, 2021
- Tae Hang-ho
- Â Jeon Chang Soo 4 episodes, 2019
- John D. Michaels
- Â Commisioner / ... 4 episodes, 2021
- Kim Si-eun
- Â Kwon Saet-byeol 4 episodes, 2021
- Carson Allen
- Â Tina / ... 3 episodes, 2017-2019
- Lee Joo-seung
- Â Hwang Kyung Il 3 episodes, 2017
- Yoon Kyung-ho
- Â Yoon Pil-bae 3 episodes, 2017
- Han Bo-bae
- Â Park Eun Byul 3 episodes, 2017
- Lee Yong-nyeo
- Â Park Bok Soon 3 episodes, 2017
- Kim Ji-hoon
- Â Woo Bong-gil 3 episodes, 2017
- Jung Joon-won
- Â Hwang Kyung Il (young) 3 episodes, 2017
- Tongha Pak
- Â Ryoji 3 episodes, 2019
- Chae Won-Bin
- Â Gong Su Ji 3 episodes, 2021
- Jeon Soo-jin
- Â Park Bok Nim 2 episodes, 2017
- Cha Soo Yeon
- Â Heo Ji-hye (2017) 2 episodes, 2017
- Kim Hyeon-Ok
- Â Im Mi Ho 2 episodes, 2017
- Park Ha-jun
- Â Bang Je Soo (young) 2 episodes, 2018
- Park Eun-seok
- Â Go David 2 episodes, 2018
- Lee Joo-won
- Â Hwang Ji Wook 2 episodes, 2018
- Joo Min-ha
- Â Ahn Hee-jin 2 episodes, 2018
- Heo Sung-tae
- Â Drug dealer 2 episodes, 2019
- Jung Gi-sub
- Â Suzuki Kenichi Takahiro (Ryokan owner) 2 episodes, 2019
- Kim Seung-wook
- Â Song Soo-chul 2 episodes, 2019
- Lee Han-ik
- Â Jin-shik's friend 2 episodes, 2019
- Kim Yong-hee
- Â Doctor Hwang Jo-byeong 2 episodes, 2019
- Kim Pub-lae
- Â Captain Park Hyun 2 episodes, 2021
- Sung Byoung-sook
- Â Go Soon Rye 2 episodes, 2021
- Woo Mi-hwa
- Â Jang Ye-sook 2 episodes, 2021
- Lee Yi-Dam
- Â Lisa Cho 2 episodes, 2021
- Shin Yeon-woo
- Â Lee Ha-eun 2 episodes, 2021
- Choi Ji-yeon
- Â Gam Soon 2 episodes, 2021
- Enrico Dennis
- Â Black dragon gang member 2 episodes, 2021
- Kim Cheol-Yun
- Â Detective 2 episodes, 2021
- Jo Jae-yoon
- Â Gangster 1 episode, 2017
- Lee Joon-hyuk
- Â Pimp 1 episode, 2017
- Kim Roe-ha
- Â Nam Sang-Tae 1 episode, 2017
- Yun Ji-min
- Â Jang Gyu A 1 episode, 2017
- Son Jong-hak
- Â Kang Gook Hwan 1 episode, 2017
- Kwon Kim
- Â Psychopathic doctor 1 episode, 2017
- Shin Seung-hwan
- Â Shim Young-Woon 1 episode, 2017
- Song Young-kyu
- Â Park Eun-Cheol 1 episode, 2017
- Oh Yeon-ah
- Â Jin Hyeok's wife 1 episode, 2017
- Park Eun-yeong
- Â Park Mal Nyeon 1 episode, 2017
- Ki-sub Choi
- Â Tabloid 1 episode, 2017
- Lee Jung-shin
- Â Cricket / ... 1 episode, 2018
- Park Ok-chool
- Â Doo-won's hostage 1 episode, 2018
- Min Ji
- Â Go Ye-ji 1 episode, 2018
- Kim So-sook
- Â Poongsan Fish Market vendor 1 episode, 2018
- Lee Seung-joon
- Â Kim Bong-soo (Elevator service engineer) 1 episode, 2018
- Myung Seok-Geun
- Â Doctor 1 episode, 2018
- Sung-Han Song
- Â Young Mo Tae-Goo 1 episode, 2018
- Lee Tae-ri
- Â Tomoyuki 1 episode, 2019
- Ko Han-min
- Â Assistant Lim Hyun-chan 1 episode, 2019
- Kim Ji-sung
- Â Yeom Mi-jeong (Director of Eunhye Animal Hospital) 1 episode, 2019
- Kwon Ban-suk
- Â Bldg. security room staff 1 episode, 2019
- Lee Joo Shil
- Â Park Eun Soo's grandmother 1 episode, 2021
- Choi Jae-sup
- Â Park Jong Bum 1 episode, 2021
- Kim Joong-hee
- Â Gu Up Jin 1 episode, 2021
- Daniel Joey Albright
- Â Matt 1 episode, 2021
- Baek Seung-chul
- Â Lee Jong Bak 1 episode, 2021
- Gil Hae-Yeon
- Â Commissioner Kam Jong Sook 1 episode, 2021
- Lee Eol
- Â Yang Bok Man 1 episode, 2021
- Jo Yoo-jeong
- Â Soo-ji's guardian 1 episode, 2021
- Won Mi-won
- Â Joo Bum-tae's grandmother 1 episode, 2021
- Hong Sang-pyo
- Â Bu Gwi Nam 1 episode, 2021
- Mitch Craig
- Â Ricky's henchman 1 episode, 2021
- Eom Ji-seong
- Â Joo Bum Tae 1 episode, 2021
- Yoo Soon-woong
- Â Resident Sonang Village 1 episode, 2021
- Kim Kyu-na
- Â Village girl 1 episode, 2021
- Yang Joo-ho
- Â Ko Won Ki 1 episode, 2021
- Kim Ye-eun
- Â Girl in Ha Eun's story 1 episode, 2021
- Kim Mi-ra
- Â NFS examiner 1 episode, 2021
- Andreas Varsakopoulos
- Â Ricky Gonzalez 1 episode, 2021
- Han Kap-soo
- Â Yoo Jae Chun 1 episode, 2021
- Chul-Woo Han
- Â Ko Deok Hwan 1 episode, 2021
- Cha Yoo-Hyun
- Â Lee Hyun Min 1 episode, 2021
- Oh Min-Jeong
- Â Gong Sook Hee 1 episode, 2021
- Kim Yoo-Nam
- Â Circus Man member 1 episode, 2021
- Moon Chang-Kil
- Â Joo Bum Tae's grandfather 1 episode, 2021
