Love in the Moonlight (2016)
Hong Ra On disguises herself as a man and counsels men on dating. Due to a love letter she wrote for a client, she meets Crown Prince Hyo Myeong. Ra On is unaware that he is the Crown Prince and Hyo Myeong is unaware that Ra On is a woman. The Crown Prince becomes interested in Ra On. His eunuchs become aware of this and attempt to get Ra On to become one of them.