Jo Jung Suk as Lee In
Shin Sae Kyeong as Kang Hee Soo / Kang Mong Woo
Lee Shin Young as Kim Myung Ha

Supporting Cast

Park Ye Young as Court Lady Dong [Lee In’s lady-in-waiting]
Jo Sung Ha as Kim Jong Bae [Minister of military affairs]
Choi Dae Hoon as Lee Sun [Lee In’s older brother]
Yang Kyung Won as Yoo Hyun Bo [Assistant section chief of the Ministry of Rites]
Lee Kyu Hoe as Park Jong Hwan [Queen Dowager Park’s older brother]
Son Hyun Joo as Kang Hang Soon [Hee Soo’s father]
Na Hyun Woo as Chu Dal Ha [Hee Soo’s assistant]
Jang Young Nam as Queen Dowager Park [Lee In’s biological mother]
Ahn Shi Ha as Queen Kim [Lee Sun’s Wife]
Kang Hong Suk as Joo Sang Hwa [Lee In’s royal guard]
Han Dong Hee as Hong Jang [Yoo Hyun Bo’s sister]
Song Sang Eun as Ja Geun Nyun [Servant]
Jung Suk Yong as Se Dong [Spy]
Jeon Soo Ji as Court Lady Han [Queen Dowager Park’s assistant]
Choi Ye Chan as Grand Prince Dae Gun [Lee Sun’s son]
Ha Seo Yoon as Queen Oh [Lee In’s Wife]
Ahn Se Eun as Royal Princess Jang Ryung [Lee Sun’s daughter]
Uhm Hyo Sub as Oh Wook Hwan [Queen Oh’s father]
Kim Bo Yun as Bu Yeong [Se Dong’s adopted daughter]
Jo Jae Ryong as Jung Je Pyo [Qing Dynasty official]
Go Soo Hee as Jeom Yi Nae [Se Dong’s wife]
Baek Suk Kwang as Min Ji Hwan [Jong hwan’s right-hand man]
Kim Seo Ha as Min sang Hyo [Ji Hwan’s brother]
Lee Yoon Hee as Kim Je Nam [Kang Hang Soon’s old friend]