His Highness the King of the Palace.
Kim Min-gyu. A cousin of Crown Prince Jeong-guk.
Kang Eun-bo is the twin of Kang Eun-gi.
Yook Sungjae, the king's eunuch.
and
Park Eun-soo, the queen of the palace. Originally, Eun-bo was the queen, but it has been two years since she was changed to Eun-soo.
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