Characters played by Daekyum Ahn
Storage tank hazmat suit
Characters played by Do-bin Baek
Rescue team chief
Characters played by Seung-Hoon Choi
Young Jae-hyeok
Characters played by Sung-Wook Eo
Dae Soo-Won
Characters played by Bae Gang-Yoo
Min-jae
Characters played by Jo Han-chul
CEO of Simwon E&C
Characters played by Kim Han-Jong
Jin-taek
Characters played by Kwon Hong-Suk
Presidential spokesperson
Characters played by Kim Hye-Eun
First Lady (Korean president's wife)
Characters played by In-gi Jeong
Firefighter chief
Characters played by Moon Jeong-Hee
Jeong-hye
Characters played by Hyun-Joon Ji
Jae-hyeok's older brother
Characters played by Hong Ji-Young
Female patient
Characters played by Deok-hyeon Jo
Institute of Nuclear Safety director
Characters played by Kim Jong-goo
Chairman of Council for Nuclear Safety
Characters played by Son Jong-hak
President of Korea Hydro & Nuclear Power
Characters played by Jin-mo Joo
Public administration minister
Characters played by Kim Joo-Hyun
Yeon-joo
Characters played by Jin-young Jung
(as Jung Jin-Young)
Characters played by Dae-Myung Kim
Gil-seop
Characters played by Myung-Min Kim
President
Characters played by Nam-gil Kim
Jae-hyeok
Characters played by Se-dong Kim
Mr. Nam
Characters played by Yeong-ae Kim
Mrs. Seok
Characters played by Jung-Hwan Kong
Senior presidential secretary
Characters played by In-Joon Kwak
Head of foreign cooperation
Characters played by Lee Kyung-young
Prime minister
Characters played by Seung-Joon Lee
Disaster and safety team 1
Characters played by Seung-dae Lim
Team Leader of Simwon E&C
Characters played by Jang Nam-boo
Resident worker
Characters played by Ye-Seol Oh
New nurse
Characters played by Pal-Young Park
Minister of Commerce
Industry and Energy
Characters played by Seon-hee Park
Mr. Gam's Wife
Characters played by Kang Shin-il
Mr. Kong
Characters played by Young-kyu Song
Leader of instrumentation and control team
Characters played by Joo Suk-tae
Firefighter 1
Characters played by Kim Tae-Hyun
Nuclear power plant employee 3
Characters played by Park Yong
Simwon E&C worker 1
Characters played by Seung-mok Yoo
Mr. Kam
Characters played by Song Young-Chang
New director at nuclear power plant
Characters played by Song Young-Jae
Jae-hyeok's father
Characters played by Kim Young-woong
Mr. Hwang