- Min Nam-koong
- Â Han Ji Hyuk 12 episodes, 2021
- Park Ha-seon
- Â Seo Soo-yeon 12 episodes, 2021
- Kim Ji-eun
- Â Yoo Je Yi 12 episodes, 2021
- Jang Young-nam
- Â Do Jin Suk [NIS overseas division deputy director] 12 episodes, 2021
- Kim Do-hyun
- Â Ha Dong Gyun [NIS crime info integration center team 1] 12 episodes, 2021
- Park Jin-woo
- Â Cha Min Cheol [NIS field support team member] 12 episodes, 2021
- Kim Jong-tae
- Â Kang Pil Ho [NIS overseas division director] 12 episodes, 2021
- Im Chul-hyung
- Â Kim Dong-hwan 12 episodes, 2021
- Nam Tae-hoon
- Â Jeon Heung-sik 12 episodes, 2021
- Ok Ja-yeon
- Â Lin Wei [China Ministry of State Security agent] 5 episodes, 2021
- Hyun Bong-sik
- Â Chun Myung-ki (NIS server management agent) 5 episodes, 2021
- Yu Oh-seong
- Â Baek Mo Sa 5 episodes, 2021
- Lee Kyoung-young
- Â Lee In Hwan [NIS domestic division deputy director] 5 episodes, 2021
- Park Won-sang
- Â Nam Seon-woo 5 episodes, 2021
- Park Hyuk-kwon
- Â Lee Myung-cheol 5 episodes, 2021
- Jung Moon-sung
- Â Jang Chun Woo 5 episodes, 2021
- Jung Ji-yoon
- Â Kim Yeo Jin [NIS psychologist] 5 episodes, 2021
- Hwang Hee
- Â Oh Kyung Seok [NIS Black Sheep team agent] 5 episodes, 2021
- Kim Min-sang
- Â Jeong Yong Tae [NIS director] 5 episodes, 2021
- Lee Jae-kyoon
- Â Lee Choon Gil 5 episodes, 2021
- Jo Bok-rae
- Â Kim Dong Wook [NIS Black Sheep team agent] 5 episodes, 2021
- Kwon So-hyun
- Â Goo Hyo Eun [NIS field support team member] 5 episodes, 2021
- Kim Byeong-ki
- Â Bang Young Chan [NIS director] 5 episodes, 2021
- Shin Moon-Sung
- Â Jang Kwang Cheol 5 episodes, 2021
- Sung No-Jin
- Â Hwang Mo Sul 5 episodes, 2021
- Ahn Jung-Ho
- Â [Agent] 5 episodes, 2021
- Kim Ji-sung
- Â Jeong Gi-seon 3 episodes, 2021
- Park Ji-yeon
- Â Jung Eun-hee 2 episodes, 2021
- Eom Ji-man
- Â Ji Gook-chul 2 episodes, 2021
- Lee Dong-kyu
- Â Memorial speaker 1 episode, 2021
- Seo Yeon-Woo
- Â [Daughter stowaway] 1 episode, 2021
- Park Young-bok
- Â [Father stowaway] 1 episode, 2021
- Hong Suk-bin
- Â [Psychiatrist] 1 episode, 2021
- Jeong Han-bin
- Â Agent 1 episode, 2021
- Yeo Woon-bok
- Â [Doctor] 1 episode, 2021
- Kwon Oh-jin
- Â [Boat surgeon] 1 episode, 2021
- Im Dong Min
- Â [Coast guard] 1 episode, 2021
- Im Chae Sun
- Â [Boat crew member] 1 episode, 2021
- Lee Moo Nyoung
- Â [Taxi driver] 1 episode, 2021
