IU
Go Hajin / Lady Hae Soo

Lee Joon-gi
Wang So (4th Prince)

Kang Ha-neul
Wang Wook (8th Prince)

Hong Jong-hyun
Wang Yo (3rd Prince)

Baekhyun
Wang Eun (10th Prince)

Nam Joo-hyuk
Wang Baeka (13th Prince)

Kim Ji-soo
Wang Jeong (14th Prince)

Kim San-ho
Wang Mu (Crown Prince / 1st Prince)

Seohyun
Princess Woohee

Kang Hanna
Princess Hwangbo Yeonhwa / Queen Daemok

Jin Ki-joo
Chaeryeong

Ji Hye-ran
Park Soondeok

Sung Dong-il
General Park Soogyeong

Kim Sung-kyun
Choi Jimong / Homeless Man

Jo Min-ki
King Taejo

Kim Kang-il
Shincheon Kang

Park Ji-young
Queen Yoo / Queen Shinmyeong

Park Jeong-hak
Wang Shikryeom

Woo Hee-jin
Court Lady Oh Sooyeon

Park Si-eun
Lady Hae Myeong

Jung Kyung-soon
Queen Hwangbo / Queen Shinjeong

Choi Byung-mo
Park Younggyu

Lee Ho-jung
Aera