Ra On lives as a boy named Sam Nom in the capital, getting paid to help unrequited lovers find their path towards each other. Lee Yeong, the crown prince, is more interested in visiting the capital and playing hooky rather than focusing on his studies.

Ra On enters the palace as a eunuch, still living under the fake identity of Sam Nom. Although she tries her very best to get out of the palace, her plan fails every time.

Ra On expected herself to be failed from the exam with reference to become the Eunich. However, owing to the decisive help from the crown prince, Ra On stays at the palace. The king decided to make Lee Yeong, the crown prince as his regent.

Lee Yeong, the crown prince is in charge of the King's 40th birthday and the reception for the Qing's envoy. Furthermore, the crown prince invited Gisaengs from all of the country of the eight provinces and he started to create dance for the Gisaengs.

Lee Yeong, the crown prince rescued Ra On from the deep pond. Ra On begged forgiveness to Lee Yeong. Furthermore, Mok Tae Gam from Qing requested unreasonable tribute to Joseon and Lee Yeong, the crown prince come into conflict with his father & Kim Heon.

Lee Yeong, the crown prince feels confusing on Ra On as a maiden and he intentionally treats her cold-heartedly. Ma Jong Ja takes Ra On to Mok Tae Gam after hearing a news that he is looking for a soloist at the play.

Lee Yeong, the crown prince and Ra On confuse themselves of their feeling. One day, the rumor go around about a relationship between a Eunich and a court lady. Ra On helps the people whom are involved in the rumor and she fall into danger.

Lee Yeong, the crown prince starts to behave as a regent but he has deeper conflict with Kim Heon regarding the Royal Examination. Ra On suffers from not telling the truth of herself after the confession from the crown prince.

Ra On has deeper thought of the words from the crown prince that he will treat her as a woman. This made Ra On to avoid the crown prince...

The King is agitated regarding the palace situation and he is hastening the marriage of crown prince in order to show strong force of the royal family.

When checking the King's meal, the silver spoon turns black and this goes to blame on child from lantern festival and her father. Owing to the help of Eunuch Do and Teacher Dasan, Lee Yeong reveals that the child and her father are innocent.

Ra On overhears the talks between her mother and Teacher Dasan and she gets to know that she is the daughter of Hong Gyeong Nae. Thus, Ra On tries to organize the last moment with Lee Yeong, the crown prince and she leaves the palace.

Kim Heon is looking for Ra On who is a daughter of Hong Gyeong Nae and his group gets closer to find out who it is. There are rumors go around that Hong Ra On was the spy of the East Palace attack and this is conveyed to Lee Yeong, the crown prince.

Kim Heon and his group are trying to seize Ra On so they keep chasing whereabout. Lee Yeong, the crown prince is about to marry with crown princess. Lee Yeong, the crown prince and Ra On try to abandon their love for each other.

On a wedding day, Hong Gyeong Nae appears and it makes everyone shocked. Lee Yeong, the crown prince feels complicated by seeing his lover's father who is a traitor. Ra On also feels complicated by seeing her mother's dedicated love for her father.

Lee Yeong, the crown prince is in shock due to the fact that Byeong Yeon is the member of White Clouds Society. Without Byeong Yeon, the crown prince traces the real culprit of east palace attack to find out the truth behind the case.

Lee Yeong, the crown prince collapses after drinking potion and he can see Ra On in his dream. However, when he comes around, he can see Ha Yeon. On the other hand, there is a rumor going around that the crown prince is in a critical condition.