A young Joseon woman who's lived her whole life as a man ends up as a eunuch in the royal palace, where she begins to bond with the crown prince.

Park Bo-gumas Lee Yeong / Crown Prince Hyo Myeong
Kim You-jungas Hong Ra-on / Hong Sam-nom
Jung Jin-youngas Kim Yoon-seong
Chae Soo-binas Jo Ha-yeon
Kwak Dong-yeonas Kim Byeong-yeon
Kim Seung-suas King Soonjo
Jeon Mi-seonas Consort Park Soo-ki
Heo Jung-eunas Princess Yeongeun
Jung Yoo-minas Wol-hee
Cheon Ho-jinas Premier Kim Heon