Sul Kyung-gu as Kim Jae-guk

Doh Kyung-soo as Hwang Sun-woo

Kim Hee-ae as Yoon Moon-yeong

Park Byung-eun as Jeong Min-gyu

Jo Han-chul as The Minister

Choi Byung-mo as The Vice Minister

Hong Seung-hee as Kang Han-byul

Lee Sung-min as Hwang Gyu-tae

Kim Rae-won as Lee Sang-won

Lee Yi-kyung as Cho Yoon-jong

Choi Jung-woo as The President

Park Seon-yeong as Narrator

Brad Little as NASA Administrator

Paul de Havilland as NASA Deputy Administrator

Jonathan Ehren Groff as James Glenn

Brian M. Van Hise as Andy Walker

Gina Theresa Williamson as Julie Anderson

Jack Lyons as William Jones

Baek Seung-chul as Rescue Leader

Han Soo-hyun as FDO

Kim Dong-hwan as INCO

Chun Sin-hwan as Guidance

Lee Sang-won as Prop

Yeom Ji-young as Telmu

Lee Yoon-jae as Doctor 1

Choi Dae-sung as Doctor 2

Cha Young-ju as Space Center Staff

Kang Jun-seok as Space Center Staff

Jung Yun-ha as TM/TC

Choi Pil-sang as Space Center Staff