Three elite North Korean sleeper agents live under cover for so long that they believe their cover stories are their real identities. They are shocked when they are ordered to kill one another or face death at the hands of an elite hit team.
| Actor | Role |
|---|---|
 Kim Soo-hyunWon Ryu-hwan / Bang Dong-gu | Won Ryu-hwan / Bang Dong-gu |
 Park Ki-woongLee Hae-rang | Lee Hae-rang |
 Lee Hyun-wooLee Hae-jin | Lee Hae-jin |
 Son Hyun-jooKim Tae-won | Kim Tae-won |
 Park Hye-sookSun-im | Sun-im |
 Ko Chang-seokSeo Sang-gu | Seo Sang-gu |
 Kim Sung-kyunSeo Soo-hyuk | Seo Soo-hyuk |
 Jang KwangKo | Ko |
 Shin Jung-keunMr. Park | Mr. Park |
 Hong Kyung-inJo Doo-seok | Jo Doo-seok |
 Lee Chae-youngRan | Ran |
 Park Eun-binYoon Yoo-ran | Yoon Yoo-ran |
 Choi Woo-shikYoon Yoo-joon | Yoon Yoo-joon |
 Goo Seung-hyunHwang Chi-woong | Hwang Chi-woong |
 Um Tae-gooHwang Jae-oh | Hwang Jae-oh |
 Kim Beop-raeNIS General Manager | NIS General Manager |
 Jo Yong jinSe-yoong | Se-yoong |
 Jo Young-jinKim Hui-gwan | Kim Hui-gwan |
 Lee Yeon-kyungChi-woong's Mother | Chi-woong's Mother |
 Ko In-beomNIS | NIS |
 Yoo JunYoung Lee Hae-rang | Young Lee Hae-rang |
 Joo HyunRi Moo-hyuk | Ri Moo-hyuk |
 Park Hwi-soonKo's son | Ko's son |
 Sung Yoo-binYoung Hae-jin | Young Hae-jin |
 Lee Kyu-seopBurly Henchman 1 | Burly Henchman 1 |
| YYook Se-jinNIS Agent B | NIS Agent B |
 Ahn Soo-hoPostman 2 | Postman 2 |