After a chance meeting in a hospital, an ardent soldier falls for a gifted surgeon. Opposing philosophies tear them apart, but fate has other plans.
| Actor | Role |
|---|---|
 Song Hye-kyoKang Mo-yeon | Kang Mo-yeon |
 Song Joong-kiYoo Shi-jin | Yoo Shi-jin |
 Kim Ji-wonYoon Myung-joo | Yoon Myung-joo |
 Jin GooSeo Dae-young | Seo Dae-young |
 OnewLee Chi-hoon | Lee Chi-hoon |
 Kang Shin-ilLieutenant General Yoon | Lieutenant General Yoon |
 Cho Tae-kwanDaniel Spencer | Daniel Spencer |
 Jo Jae-yunJin Young-soo | Jin Young-soo |
 Hyun Jyu-niDoctor Pyo | Doctor Pyo |
 Jeon Soo-jinRi Ye-hwa | Ri Ye-hwa |
 Lee Seung-joonSong Sang-hyun | Song Sang-hyun |
 Kim Min-seokKim Ki-bum | Kim Ki-bum |
 Ahn Bo-hyunSergeant Im Gwang-nam | Sergeant Im Gwang-nam |
 David Lee McInnisArgus | Argus |
 Lee Yi-kyungKang Min-jae | Kang Min-jae |
 Kim Byong-chulPark Byung-soo | Park Byung-soo |
 Park Hwan-HeeChoi Min-Ji | Choi Min-Ji |
 Elena ZhernovayaValentine | Valentine |
 Jo Woo-riJang Hee-eun | Jang Hee-eun |
 Tae In-hoHan Seok-won | Han Seok-won |
 Seo Jeong-yeonNurse Ha Ja-ae | Nurse Ha Ja-ae |
 Park HoonChoi Woo-geun | Choi Woo-geun |
 Choi WoongGong Cheol-ho | Gong Cheol-ho |
 Shin Dong-hoonAgent | Agent |
 Kim Hyo MyungThug | Thug |
 Ariane Desgagnés-LeclercValentine | Valentine |