Yoon Eun Hye (윤은혜) as Shin Chae-kyeong
Princess Consort to the Crown Prince of the Empire Shin Chae-kyeong (황태자비 신채경)
Joo Ji Hoon (주지훈) as Lee Shin
Grand Prince Lee Shin (대군 이신)
Crown Prince of the Empire Lee Shin (황태자 이신)
Kim Jeong Hoon (김정훈) as Lee Yool
Crown Prince of the Empire Lee Yool (황태자 이율)
Royal Prince Lee Yool (대군 이율)
Prince Uiseong (의성군)
Song Ji-hyo (송지효) as Min Hyo-rin
Lee Yoon Ji (이윤지) as Hyae-Myeong
Princess of the Empire Hyae Myeong (혜명 옹주)
Jeon Ji Ae as Lee Kang-hyun
Nah Eun-kyeong (나은경), as Kim Soon-young
Dan Ji (단지) as Yoon Hee-soong
Kang Nam Gil (강남길) as Chae-kyeong's father
Im Ye Jin (임예진) as Chae-kyeong's mother
Kim Suk as Shin Chae-joon (Chae-kyeong's younger brother)
Kim Sang-joong (김상중), as Yi Soo (Yool's deceased father)
Crown Prince of the Empire Yi Soo (황태자 이수)
Park Chan-hwan (박찬환), as Yi Hyeon (Shin's father)
Grand Prince Yi Hyeon (대군 이현) (by birth, the youngest offspring of Emperor Moo)
Crown Prince of the Empire Yi Hyeon (황태자 이현)
Emperor/King Yi Hyeon (이현 황제)
Kim Hye-ja (김혜자), as Yool and Shin's grandmother
Dowager Empress Park (황태후 박씨)
Shim Hye-jin (심혜진), as Lady Hwa-Yong (Yool's mother)
Princess Consort to the Crown Prince of the Empire Seo Hwa-Yong (황태자비 서화영) (wife of Crown Prince Yi Soo)
Yoon Yoo-seon (윤유선), as the Queen (Yi Shin's mother)
Princess Consort to the Grand Prince Min (민씨)
Empress/Queen Min (황후 민씨)
Choi Seong-joon (최성준), as Kang-in (강인)
Lee Yong-joo (이용주), as Jang-kyung (장경)
Uhm Seong-mo (엄성모), as Ryu-hwan (류환)
Choi Bool-am (최불암), as Emperor Seongjo (성조 황제) (Shin and Yool's grandfather) (deceased)
Lee Ho-jae (이호재), as Gong Nae-kwan (공 내관)
Jeon Su-yeon (전수연), as Choi Sang-goon (최 상궁)