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