Moonlight Drawn by Clouds

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 Lee Yung---future Crown Prince Hyomyung. Hong Ra On is unaware that he is the Crown Prince and Lee Yung is unaware that Hong Ra On is a woman. The Crown Prince becomes interested in Hong Ra On. As nobody is aware of Ra On being a woman, she is sold to the palace and becomes an eunuch...