Set during the reign of King Sukjong in the Joseon dynasty, the story focuses on Dong Yi, a water maid who gains the trust of Queen Inhyeon and later the favour of the king when he is moved by her prayers for the health of the Queen during the court disputes caused by Jang Hee Bin. Dong Yi becomes a concubine with the rank of sook-bin and bears a son who will later become the 21st king of Joseon, Yeongjo.
Han Hyo-joo
Park Ha-seon
Jeong Dong-hwan
Ji Jin-hee
Lee So-yeon
Bae Soo-bin
Jung Jin-young
Kim You-jung
Lee Kwang-soo
Kim Dong-yoon
Yeo Hyun-soo
Oh Yeon-seo
Choi Cheol-ho
Nam Da-reum
Jeong Yu-mi
Kwon Hae-sung
Kim Woo-seok
Park Jung-soo