The drama features Ji Jin-hee as King Sukjong and Han Hyo-ju as the water maid Dong-yi who turns concubine, then mother to a future king. Lee So-yeon follows her vengeful Angel’s Temptation role as Lady Jang, a higher-ranking concubine that’s described as a villain role. Bae Su-bin is Dong-yi’s caring protector.
Han Hyo-ju shared her feelings on donning the clothes for the first time: “Wearing the costume makes it feel real, as though the outline has been revealed. Even when I’d seen the synopsis and script, I didn’t picture things clearly, but after seeing how it looks I can imagine it better.” Because she takes the title role, Han will be bearing much of the burden of the drama; she said, “The director told me that he’d watched all of my projects, and deliberated about what would suit me best, from head to toe. I think we’ll be fine if I can do a good job.”
She also called the drama a “sageuk CSI,” since there are scenes that involve Dong-yi investigating matters.
Lee So-yeon said, “I’m playing another villain, but I’ll show a Lady Jang that’s different from previous portrayals, one with my own appeal.”