Usia saat memerankan Descendants of the Sun
Cast
Main
1. Song Joong-ki as Captain Yoo Si-jin (a.k.a. Big Boss)[11] ➡ 31
2. Song Hye Kyo as Doctor Kang Mo-yeon (a.k.a. Beauty)[12] ➡ 34
3. Jin Goo as Sergeant Major Seo Dae-young (a.k.a. Wolf)[13] ➡ 36
4. Kim Ji-won as First Lieutenant Yoon Myung-ju[14] ➡ 24
Recurring
Alpha Team Members
5. Park Hoon as Staff Sergeant Choi Woo-geun - Bomb Expert (a.k.a. Snoopy)
6. Choi Woong as Staff Sergeant Gong Cheol-ho (a.k.a. Harry Potter) ➡ 29
7. Ahn Bo-hyun as Sergeant First Class Im Gwang-nam (a.k.a. Piccolo) ➡ 28
Haesung Hospital Medical Services Team
8. Onew as Lee Chi-hoon (1st year resident of Thoracic Surgery a.k.a. Handsome Spaceman)[15] ➡ 26
9. Lee Seung-joon as Song Sang-hyun (General Surgeon) ➡ 43
10. Seo Jeong-yeon as Ha Ja-ae (ER Senior Nurse)
11. Park Hwan-hee as Choi Min-ji (ER Nurse) ➡ 26
People at Haesung Hospital
12. Hyun Jyu-ni as Pyo Ji-soo (Pathology Specialist) ➡ 31
13. Tae In-ho as Han Suk-won (Chairman of Haesung Hospital) ➡ 36
14. Park Ah-in as Kim Eun-ji (Thoracic Surgery Specialist)
15. Jo Woo-ri as Jang Hee-eun (1st Year Resident of Anesthesiology) (wife of Dr. Lee Chi-hoon)[16] ➡ 24
Tae Baek Army
16. Kang Shin-il as Lieutenant General Yoon Gil-joon (a.k.a. Yellow Tiger) (Myung-ju's father) ➡ 55
17. Kim Byeong-cheol as Lieutenant Colonel (later promoted to Colonel) Park Byung-soo
18. Kim Min-seok as Private First Class Kim Gi-bum (later promoted to Staff Sergeant as seen in ep 16). A pickpocket later enlisted to the army. ➡ 26
Uruk area
19. Cho Tae-gwan as Daniel Spencer (Peacemaker Emergency Doctor Team)[17]
20. Jeon Soo-jin as Ri Ye-hwa (Peacemaker Emergency Nurse Team) ➡ 27
21. David Lee McInnis as David Argus (Gang Boss, former Delta Force Captain), the main antagonist. ➡ 42
22. Dean Dawson as the Chief of Police (Tae Baek Police Chief)
23. Jo Jae-yoon as Jin Young-soo (Chief Manager of Uruk Electric Power Corporation) ➡ 42
24. Lee Yi-kyung as Kang Min-jae ➡ 27
25. Zyon Barreto as Fatima
26. Elena Zhernovaia as Valentine[18]
27. David Pipes as Martin (World Times Reporter)
28. Ji Seung-hyun as Senior Lieutenant Ahn Jung-joon, Korean People's Army. ➡ 34
29. Kwak In-joon as Lee Han-soo (Minister of Foreign Affairs)
30. Joey Albright as US Army Delta Force member
Special appearances
31. Lee Kwang-soo as shooting arcade operator (episode 1)[19] ➡ 31
32. Lee Jong-hyuk as Captain Kim Jin-seok (episode 2, 5, 10, 15) ➡ 42
33. Matthew Douma as Jordan, US Army Delta Force Captain (episode 2, 10, 12)[20]
34. Jung Ji-won as TV announcer (episode 2)
35. Park Tae-won as TV announcer (episode 2)
36. Ryu Hwa-young as Seo Dae-young's ex-girlfriend (episode 4) ➡ 23
37. Jun In-taek as Yoo Young-geun (Yoo Shi Jin's father) (episode 6, 7, 15, 16)
38. Park Joon-geum as Lee Chi-hoon's mother (episode 7, 11)
39. Yoo Ah-in as bank reception Eom Hong-shik (episode 13)[21] ➡ 30
40. Nam Ki-ae as Kang Mo-yeon's mother (episode 13)
41. Lee Jae-yong as Lieutenant General Choi Ji-ho, Korean People's Army ➡ 53
42. Red Velvet as themselves (episode 16)
