Based on true events, renowned mountaineer Um Hong-gil sets out on a mission to Everest to retrieve his late junior climber's body and faces the greatest challenge of his life.
| Actor | Role |
|---|---|
 Hwang Jung-minUm Hong-gil | Um Hong-gil |
 Jung WooPark Moo-taek | Park Moo-taek |
 Cho Seong-haLee Dong-gyoo | Lee Dong-gyoo |
 Kim In-kwonPark Jeong-bok | Park Jeong-bok |
 Ra Mi-ranJo Myeong-ae | Jo Myeong-ae |
 Kim Won-haeKim Moo-young | Kim Moo-young |
 Lee Hae-youngJang Cheol-goo | Jang Cheol-goo |
 Jeon Bae-sooJeon Bae-soo | Jeon Bae-soo |
 Jeong Gyu-suChairman Kim | Chairman Kim |
 Seong Byeong-sukMoo-taek's Mother | Moo-taek's Mother |
 Jung Yu-miChoi Soo-young | Choi Soo-young |
 Yu SeonChoi Seon-ho | Choi Seon-ho |
 Jo Dal-hwanPD | PD |
 Jeong Jae-heonJeong Jae-heon | Jeong Jae-heon |
 Son Young-soonGrandmother | Grandmother |
 Lee Dong-heeJeong-bok's Father | Jeong-bok's Father |
 Kim Kyung-sikExecutive | Executive |
 Kang Suk-wonCameraman | Cameraman |
 Park Ji-hongSherpa | Sherpa |
 Jung ChunExpedition member | Expedition member |
| SSung Gyu-chanExpedition member | Expedition member |
 Choi Jong-ryulDoctor | Doctor |
 Yoo Jeong-hoHR manager | HR manager |
 Lee Chae-YunEom Yeon-woo | Eom Yeon-woo |
| YYoon Ji-myeongSherpa | Sherpa |