Na Kyung-soo, a diver, is angered to learn that the Coast Guard is assigning responsibility for the death of a fellow diver during the Sewol ferry disaster recovery to Ryu Chang-dae, the representative of civilian divers, and charging him with manslaughter.
| Actor | Role |
|---|---|
 Lee Ji-hoonNa Kyung-soo | Na Kyung-soo |
 Son Sung-hoRyu Chang-dae | Ryu Chang-dae |
 Park Ho-sanColonel Oh | Colonel Oh |
 Kim Young-taekAttorney Song | Attorney Song |
 Kim Chae-wonProsecutor Jo | Prosecutor Jo |
| GGil Jeong-seokJo Chi-byeok | Jo Chi-byeok |
| PPark So-yoonNa-rae's Mom | Na-rae's Mom |
 Go Gyoung-heeHye-won | Hye-won |
| PPark Min-seonReporter Eun | Reporter Eun |
 Kim Gwi-seonLee Byung-ho | Lee Byung-ho |
 Woo Yeon-seoLee Byung-ho's Daughter | Lee Byung-ho's Daughter |
| HHong Jeong-hyeDoctor Jeong | Doctor Jeong |
 Lee Seung-hunJudge | Judge |
 Mun Seong-bokSu-il | Su-il |
| LLee Seong-haSeong-pal | Seong-pal |
| KKim Dong-hunJeong-du | Jeong-du |
 Jo Ha-seokFellow Diver | Fellow Diver |
 Jo InKyung-soo's Eldest Daughter | Kyung-soo's Eldest Daughter |
| JJo Ma-riKyung-soo's Younger Daughter | Kyung-soo's Younger Daughter |
 Lee Ki-youngNot listed | Not listed |
 Kim Joong-kiNot listed | Not listed |
| SSon Kwang-sooBenz | Benz |