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 Hyomyeong (Park Bo-Gum). Hong Ra-On is unaware that he is the Crown Prince and Hyomyeong is unaware that Hong Ra-On is a woman. The Crown Prince becomes interested in Hong Ra-On. His eunuchs become aware of this and attempt to get Hong Ra-On to become one of them.
There is a crown prince who falls in love with his political eunuch. Yet, Lee Yeong, the prince, knows he cannot possibly propose his feeling. Meanwhile, Hong Raon, the subject, is scared she might show herelf in true color. What are they? Friends or lover? Should they not have met each other?
