Main characters •
Oh Man-seok as Kim Cheo-sun • Joo Min-soo as young Cheo-sun •
Koo Hye-sun as Yoon So-hwa, later
Deposed Queen Yun •
Park Bo-young as young So-hwa •
Go Joo-won as
King Seongjong •
Yoo Seung-ho as young Prince Jalsan (later Seongjong) •
Jun Kwang-ryul as Jo Chi-gyeom, head of the eunuchs •
Yang Mi-kyung as
Grand Queen Dowager Jaseong (later known as Queen Jeonghui), Seongjong's grandmother •
Jeon In-hwa as
Queen Dowager Insu, Seongjong's mother •
Ahn Jae-mo as Jung Han-soo, a eunuch • Baek Seung-do as young Han-soo •
Jeon Hye-bin as Seol-young, Chi-gyeom's adoptive sister •
Lee Jin as
Queen Yun (later known as Queen Jeonghyeon)
Supporting characters •
Shin Goo as Noh Nae-shi, Chi-gyeom's adoptive father / former eunuch •
Kim Soo-mi as old woman So-gwi, in charge of discipline at the eunuch training house •
Yoon Yoo-sun as Wol-hwa, Cheo-sun's foster mother / Soginopa's daughter) •
Kang Nam-gil as Choi Cham-bong, eunuch trainer •
Jung Tae-woo as
Yi Yung, Prince Yeonsan, King Seongjong and So-hwa's son •
Jung Yoon-seok as young Yi Yung •
Kim Sa-rang as
Eoudong Extended cast •
Yang Jung-a as Lady Oh, Cheo-sun's mother • Lee Il-jae as Kim Ja-myung, Cheo-sun's father •
Sunwoo Jae-duk as Yoon Ki-kyun, So-hwa's father • Choi Jung-won as Lady Shin, Ki-kyun's wife •
Han Da-min as
Queen Gonghye •
Kim Hee-jung as young Lady Han • Han So-jung as Court Lady Um • Yoon Hye-kyung as Royal Consort Eom Gwi-in •
Ahn Gil-kang as Kae Do-chi • Kim Jung-min as Beo Deul-yi •
Jo Jung-eun as young Deul-yi •
Kim Da-hyun as Choi Ja-chi •
Yoo Tae-woong as young Ja-chi • Kang In-hyung as Moon So-woon • Jeon Ha-eun as young So-woon • Kim Ha-kyun as Jang Soon-moo • Kim Myung-soo as Yang Sung-yoon •
Han Jung-soo as Do Geum-pyo •
Kim So-hyun as Lady Jung, Ji-gyeom's wife •
Kim Byung-se as
King Sejo • Yoo Dong-hyuk as
King Yejong • Kim Jong-gyul as
Han Myung-hoe • Kim Young-joon as Hong Gwi-nam • Shin Tae-hoon as young Gwi-nam • Kang Jae as Kim Ja-won • Choi Soo-han as young Ja-won • Lee Gun-joo as Song Gye-nam • Maeung Chang-min as young Gye-nam • Lee Sang-won as Shim Ki-soo •
Park Ha-sun as
Queen Shin, Yeonsan's wife • Kim Hyuk as Park Deok-hu, So-hwa's first love • Jung Eun-chan as Yoon Ki-hyun, So-hwa's older brother • Ho Hyo-hoon as young Ki-hyun •
Lee Young-eun as palace maid • Kim Yong-heon as Eom Nae-kwan • Kim Byung-choon as Yang Sung-yeon • Park Dong-bin as Goo Sung-gun • Choi Ha-na as Hong Bi • Lee Ji-oh as the Crown Prince, Yeonsan's son • Jun Hyun-ah as Court Lady Kam-chul • Oh Soo-min as
Jang Nok-su • Nam Hyun-joo as Han-soo's mother •
Lee Si-hoo as Eunuch • Jung Ki-sung as Jogeobi • Song Young-gyu as Lee Ki • Shin Soo-jung as Hoo Koong • Seol Ji-yoon as Court Lady Kim • Jung So-young • Kang Soo-han •
Noh Young-hak as
Grand Prince Jinseong •
Jun Tae-soo as Han Chi-geun •
Park Ji-hoon as eunuch ==Production==