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Actors: Seo In-guk (Master's Sun) as Prince Gwanghe, Lee Jung-jae (Gu Family Book) as King Seonjo, Shin Sung-rok (Trot Lover, Liar Games) as Face Reader; Actress: Jo Yoon-he (Scandal, Nine: Nine: Nine Times Time Travel)
Dramafever calls it "Servants" but this article (below) calls this new jTBC drama "Maids". Oh-Ji-ho has been cast as the male lead and Jung Yoo-mi ("Rooftop Prince") has been cast as the lead actress. http://www.dramabeans.com/2014/09/oh-ji-ho-heads-back-to-the-joseon-era-in-late-fall/
Actor: Joo Sang-wook (Cunning Single Lady); Actress: Han Ye-seul (Spy Myeongwol). Jung Gyu-woon (God's Gift-14 Days, History of A Salaryman) has been offered a role.