Insu, the Queen Mother

Grand Prince Suyang, later King Sejo

Crown Prince Uigyeong (1–23) & Seongjong of Joseon (40–54) (dual role)

Han Jung (the future Queen Insu) (1–23)

Yoon Song-yi (the future Queen Yoon) (1–23)

King Danjong

Lady Yang Hye-bin, Sejong's concubine

Han Hwak

Han Myung-hoe

Deposed Queen Yoon (23–54) Jin Ji-hee as Yoon Song-yi (the future Queen Yoon) (1–23)

Queen Ansun, Yejong's second wife

Lady Yun, later Queen Jeonghui

Queen Jeongsun, Danjong's wife

Grand Prince Haeyang, later King Yejong

Se-seon

Gwon Ram

Queen Insu (23–60) Hahm Eun-jung as Han Jung (the future Queen Insu) (1–23)

King Sejong

King Munjong

Prince Jasan, later young King Seongjong (23–40)

Jang Nok-su, Yeonsan's concubine

Lady Han, Prince Gyeyang's wife and Jung's older sister

Yoon-goo

King Yeonsan