Suho as Prince Lee Gon
Hong Ye Ji as Choi Myung Yoon
Myung Se Bin as Queen Dowager Min Soo Ryun
Kim Min Kyu as Grand Prince Do Sung
Kim Joo Heon as Choi Sang Rok

Supporting Cast

Yoo Se Rye as Jung Jeon Yoon / Queen Yoon [King Hae Jong’s second wife]
Jeon Jin Oh as Hae Jong [Current King of Joseon / Lee Gon & Do Sung’s father]
Cha Kwang Soo as Yoon Yi Gyeom [Queen Yoon’s father]
Kim Seol Jin as Gab Seok [Lee Gon’s companion]
Park Sung Yun as Kim Sang Gung [Queen Dowager Min’s lady-in-waiting]
Son Jong Bum as Yoon Jeong Dae [Head of capital bureau]
Kim Sung Hyun as Han Sang Soo [Lee Gon’s eunuch]
Kim Tae Geun as Kim Dae Seung [Office of Censors’s official]
Choi Jong Yoon as Jung Young [Royal guard]
Seo Jae Woo as Moo Baek [Sang Rok’s bodyguard]
Kim Noh Jin as Oh Wol Yi [Myung Yoon’s maid]
Sul Ji Yoon as Cho Sang Goong [Queen Yoon’s lady-in-waiting]
Nam Kyung Eup as Moon Hyung [Lee Gon’s maternal grandfather]
Park Gi Ho as [King Hae Jong’s eunuch]
Won Seong Yeon as Cheol Du [Do Sung’s confidant]