Jo Min-ki as King Taejo Kim San-ho as Crown Prince Wang Mu Park Ji-young as the Dowager Empress Yoo (Taejo's 3rd Queen), mother of 3rd Prince Wang Yo, 4th Prince Wang So, and 14th Prince Wang Jung Jung Kyung-soon as the Empress Hwangbo (Taejo's 4th Queen), 8th prince Wang Wook's mother Kang Han-na as Hwangbo Yeon-hwa, 8th prince Wang Wook's younger sister Park Si-eun as Lady Hae (Myung-hee), 8th prince Wang Wook's wife[6] and Hae Soo's cousin Z.Hera as Park Soon-duk, Park Soo-kyung's daughter and 10th Prince Wang Eun's wife[7] Seohyun as Woo-hee, gisaeng and last Princess of Later Baekje[8] Park Jung-hak as Wang Sik-ryeom, the King's brother[9] Kim Kang-il as Lady Kang, Taejo's 22nd consort and 4th Prince Wang So's adoptive mother