- Song Joong-ki
- Â Captain Yoo Si Jin 19 episodes, 2016
- Song Hye-kyo
- Â Kang Mo-yeon 19 episodes, 2016
- Jin Goo
- Â Master Sergeant Seo Dae Yeong 19 episodes, 2016
- Kim Ji-won
- Â First Lt. Yoon Myeong Joo 19 episodes, 2016
- Kim Min-Seok
- Â Kim Ki Beom 17 episodes, 2016
- Kang Shin-il
- Â Lieutenant General Yoon 17 episodes, 2016
- Ahn Bo-hyun
- Â First Sergeant Lim (Piccolo) 16 episodes, 2016
- Seo Jung-yeon
- Â Nurse Ha Ja Ae 16 episodes, 2016
- Park Hoon
- Â First Sergeant Choi (Snoopy) 16 episodes, 2016
- Park Hwan-hee
- Â Nurse Choi Min-ji 16 episodes, 2016
- Choi Woong
- Â Staff Sergeant Gong (Harry Potter) 16 episodes, 2016
- Kim Byeong-cheol
- Â Lt. Colonel Park Byung Soo 15 episodes, 2016
- Lee Seung-joon
- Â Dr. Song Sang Hyeon 15 episodes, 2016
- Onew
- Â Lee Chi Hoon 15 episodes, 2016
- Hyun Jyu-ni
- Â Pyo Ji Soo 14 episodes, 2016
- Jasper Cho
- Â Daniel Spencer 12 episodes, 2016
- David Lee McInnis
- Â Captain Argus 8 episodes, 2016
- Jo Jae-yoon
- Â Jin Young Soo 8 episodes, 2016
- Jeon Soo-jin
- Â Ri Ye Hwa 6 episodes, 2016
- Nair Sachin
- Â Henchmen 6 episodes, 2016
- Tae In-ho
- Â Han Suk Won 5 episodes, 2016
- Lee Yi-kyeong
- Â Kang Min-jae 4 episodes, 2016
- Ji Seung-hyun
- Â Lt. Ahn Jung Joon 4 episodes, 2016
- Lee Jong-hyuk
- Â Captain Kim Jin-seok 4 episodes, 2016
- Matthew Douma
- Â U.S. Army Delta Force Captain Jordan 3 episodes, 2016
- Anupam Tripathi
- Â Indian Worker 2 episodes, 2016
- Zyon Barreto
- Â Fatimah 2 episodes, 2016
- Nam Moon-cheol
- Â Mr. Go 2 episodes, 2016
- Troy Zitzelsberger
- Â Assassin 2 episodes, 2016
- Yoo Ah-in
- Â Bank Clerk 1 episode, 2016
- Lee Kwang-soo
- Â Toy Shop Worker 1 episode, 2016
- Dean Dawson
- Â Chief of Police 1 episode, 2016
- Derek Chouinard
- Â U.S. Army Doctor 1 episode, 2016
- Park Ah-In
- Â Dr. Kim Eun Ji 1 episode, 2016
- Ryu Hwa-young
- Â Dae Young's ex-girlfriend 1 episode, 2016
- Jo Woo-ri
- Â Dr. Jang Hee Eun 1 episode, 2016
- Red Velvet
- Â Themselves 1 episode, 2016
- Lee Hyeon-geol
- Â Dae-yong's former soldier 1 episode, 2016
- Jung Doo-kyum
- Â VIP patient 1 episode, 2016
- Alex Kabel
- Â US Delta Force Member 1 episode, 2016
- Go Man-kyu
- Â Lieutenant Park's team 1 episode, 2016
