Main characters

• Seo In-seok as Yi Ui-bang
• Kim Heung-ki as Jeong Jung-bu
• Park Yong-woo as Gyeong Dae-seung
• Lee Deok-hwa as Yi Ui-min
• Kim Kap-soo as Choe Chung-heon
  • Ryu Deok-hwan as young Choe Chung-heon

Royal household

Male member

• Lee Sung-ho as King Injong, 17th monarch
• Lee Dong-shin as Wang Ji-in, Injong's half brother
• Lee Hwa-jin as Wang Gak-gwan, Injong's half brother
• Kim Kyu-chul as King Uijong, 18th monarch
• Kim Kyung-eung as Marquess Daeryeong
• Kim Byung-se as King Myeongjong, 19th monarch
• Lee Woo-suk as King Sinjong, 20th monarch
• Jung Tae-woo as King Huijong, 21st monarch
• Na Kyung-min as Marquess Deokyang
• Son In-woo as Duke Changwon
• Park Byung-sun as King Gangjong, 22nd monarch
  • Lee In^{[lower-alpha 1]} as young King Gangjong (Crown Prince Wang Suk)
• Oh Hyun-chul as King Gojong (Crown Prince Wang Cheol), 23rd monarch
• Jung Yoon-suk as Crown Prince Wang Jeon, later the 24th monarch King Wonjong

Female member

• Kim Yoon-kyung as Empress Dowager Im
• Kim Bo-mi as Empress Seonpyeong
• Park Eun-bin as Queen Sapyeong, Ui-bang's daughter
• Chae Min-seo as Queen Seongpyeong
• Jo Yang-ja as Queen Wondeok
• Yoon Ji-yoo as Queen Anhye
• Choi Jung-won as Queen Janggyeong
• Choi Ha-na as Princess Suan, Myeongjong's second daughter
• Oh Soo-min as Princess Yeonhee, Myeongjong's first daughter
• Yoo Hye-jung as Lady Im, Empress Dowager Im's little sister
• Lee Ja-young as Myung-Choon, Myeongjong's concubine
• Go Eun-mi as Soon-Joo, Myeongjong's concubine

Palace servant

• Jung Yong-sook as Court Lady Choi, Myeongjong's maid
• Heo Jin as Court Lady Jo, Gongye's maid
• Ahn Hae-sook as Court Lady Jang
• Yoo Byung-joon as Wang Gwang-chwi, Uijong's eunuch who died during the rebellion
• Yoo Byung-han as Hansuk
• Lee Choon-shik as Eunuch Choi
• Lee Kyung-young as Eunuch Jo, Myeongjong's eunuch

Ministers and warriors

• Joo Hyo-man as Kim Boo-shik
• Kim Jong-kyul as Moon Geuk-kyum
• Park Young-ji as Kim Don-joong, Boo-shik's son
• Heo Ki-ho as Lee Gong-seung
• Shin Dong-hoon as Moon Jang-pil
• Park Byung-ho as Jo Young-in
• Choi Sang-hoon as Jo Choong, Young-in's son
• Jung Jin-kak as Han Roi
• Yoo Soon-chul as Im Jong-shik
• Kim In-tae as Yoon In-chum
• Yang Hyung-ho as Woo Seung-kyung
• Kim Joon-mo as Yoo Eung-kyoo
• Kim Sung-won as Han Moon-joon
• Nam Young-jin as Wang Jun-myung
• Lee Il-woong as Lee In-ro
• Jung Woon-yong as Uhm Shin-yak
• Jang Chil-koon as Geum Ui
• Cha Kwang-soo as Lee Kyoo-bo
• Maeng Ho-rim as Im Yoo
• Shin Won-kyoon as Kim Koon-soo

Warriors of Uijong's era

• Kim Ki-bok as Baek Im-ji
• Kim Kyoo as Jung Se-yoo
• Lee Gye-young as Jung Jon-shil

Rebellion people

• Park Kyung-deuk as Han Sun
• Kwon Hyuk-ho as Kim Bo-dang
• Song Jong-won as Jang Soon-suk
• Yang Jae-won as Han Un-kook
• Choi Dong-joon as Jo Wi-chong
• Baek Seung-woo as Jo Kyung, Wi-chong's son
• Jeon Byung-ok as Kim Jon-shim
• Hwang Duk-jae as Hyun Duk-soo
• Lee Chi-woo as Hyun Dam-yoon, Duk-soo's father
• Park Jin-sung as Mang Yi
• Ham Suk-hoon as Mang So-yi
• Oh Sung-yul as Lee Gwang
• Lee Jae-yun as Son Chung
• Yoon Seung-won as Man-jeok
• Myung Ro-jin as Soon Jung
• Jung Doo-hong as Mi Jo-yi
• Ko Kyu-pil as Yun Bok
• Han Tae-il as Hyo Sam
• Won Wan-kyoo as Hyun Oh
• Kang Ji-hoo as Kim Sa-mi
• Kim Young-suk as Hyo Shim
• Im Jung-il as Lee Bi
• Bang Hyung-joo as Pae Jwa

People from Silla

• Moon Hoi-won as Kim Ja-yang
• Choi Dong-kyoo as a man who longing for the noble position
• Lee Do-ryun as Kim In-kyum

People in Jin dynasty

• Moon Hoi-won as Emperor Sejong, the 5th Emperor
• Park Woong as Bo, a member of the royal family
• Kim Dae-hwan as Wanyan Heng, a member of the royal family
• Joo Jin-mo as Imperial Prince Wanyan Yungong
• Shin Joon-young as Yayool Kyoo
• Lee Hyo-jung as Suk To-heuk, Sejong's father-in-law
• Park Yoo-seung as a translator
• Kim Jin-oh as Sa-sin

People in Song dynasty

• Lee Jung-yong as Emperor Heumjong, the last Emperor
• Choi Woo-hyuk as Crown Prince Zhao Chen
• Shin Goo as an old man (merchant)

People in Eastern Jin

• Yoo Dong-keun as Puxian Wannu, the 1st ruler
• Lee Ui-sun as General Wanyan Ziyuan

People in Mongol Empire

• Kim Myung-soo as Genghis Khan, the 1st Emperor
• Kil Yong-woo as Imperial Prince Ögedei
• Ji Dae-han as Imperial Prince Chagatai
• Lee Gye-young as General Sallita
• Kim Joo-ho as a Marshal general
• Go Tae-san as Vice Marshal Poridaewan
• Lee Doo-sup as Yelü Chucai
• Ahn Seung-hoon as Yelü Liuge, a vassal from Khitan Liao

People in Khitan Liao

• Ra Jae-woong as Yelü Sibu, the 1st monarch of Later Liao
• Jin Bong-jin as Gulno, the 2nd monarch of Later Liao
• Kim Kyung-ryong as Prince Geumsan, Prince of Georan and later the 3rd monarch of Later Liao
• Jung Ho-keun as Hamsa, the 5th monarch of Later Liao
• Jo Joo-hyun as a general
• Jeon Il-bum as a military officer
• Park Yoon-bae as a soldier

People in Western Xia

• Jung Bo-suk as Emperor Yangjong, the 7th monarch.
• Uhm Chul-ho as Lee Joon-wook

People in Khwarazmian Empire

• Jo Kyung-hwan as Jalal al-Din Mangburni, the last Sultan.

Other

• Park Jun-gyu as Yi Go
• Kim Ae-ran as Lady Park
• Lee Min-woo as Jeong Gyeon
• Kim Hyung-il as Choe Chung-su
• Jung Jae-gon as Choe Woo
  • Lee David as young Choe Woo
• Choi Sung-joon as Choe Hyang
  • Shin Seung-joon as young Choe Hyang