Song Joong-ki
Yoo Shi-jin (16 eps)
Song Hye-kyo
Kang Mo-yeon (16 eps)
Kim Ji-won
Yoon Myung-joo (16 eps)
Jin Goo
Seo Dae-young (16 eps)
Onew
Lee Chi-hoon (16 eps)
Kang Shin-il
Lieutenant General Yoon (16 eps)
Cho Tae-kwan
Daniel Spencer (16 eps)
Jo Jae-yun
Jin Young-soo (16 eps)
Hyun Jyu-ni
Doctor Pyo (16 eps)
Jeon Soo-jin
Ri Ye-hwa (16 eps)
Lee Seung-joon
Song Sang-hyun (16 eps)
Kim Min-seok
Kim Ki-bum (16 eps)
Ahn Bo-hyun
Sergeant Im Gwang-nam (16 eps)
David Lee McInnis
Argus (16 eps)
Lee Yi-kyung
Kang Min-jae (16 eps)
Kim Byung-chul
Park Byung-soo (16 eps)
Park Hwan-Hee
Choi Min-Ji (16 eps)
Elena Zhernovaya
Valentine (16 eps)
Jo Woo-ri
Jang Hee-eun (16 eps)
Tae In-ho
Han Seok-won (16 eps)
Seo Jeong-yeon
Nurse Ha Ja-ae (16 eps)
Park Hoon
Choi Woo-geun (16 eps)
Choi Woong
Gong Cheol-ho (16 eps)
Shin Dong Hoon
Agent (16 eps)
Kim Hyo Myung
Thug (16 eps)
Ariane Desgagnés-Leclerc
Valentine (16 eps)
Matthew Douma
Captain Jordan (3 eps)
Anupam Tripathi
Man that gives the shoe to Dr. Kang (2 eps)
Yoo Ah-in
Bank Clerk Uhm Hong-sik (1 eps)
Derek Chouinard
U.S. Army Doctor (1 eps)