[When Shengyuan (played by Kim Dong-wook Kim) was still the crown prince, he met his daughter Hua Yeon (played by Yeo-JeongJo) at the minister's house of the Sensor, and fell in love with her at first sight.But for his political ambitions, his mother betrothed Hua Yan to his half-brother as queen, and Shengyuan went away.Hwa Yeon-ben and his servant Kwon Yoo (played by Kim Min-jun-Kim) are lovers. They accidentally learned that they were going to enter the palace as concubine, so they elope but were caught by their father. In order to save their lover's life, they had no choice but to enter the palace.Five years later, His Highness was seriously ill. Under the conspiracy and arrangement of his mother, Master Shengyuan returned to the palace to inherit the throne and became a puppet emperor. Hua Yan's father was also persecuted by his mother in the coup and was executed.At this time, the Lord Shengyuan met Huayan, who had become the emperor's sister-in-law, and the constraints of power burned his forbidden desire.However, the family slave Quan You, who saved his life, failed to elope, was castrated by Shen Shen. In order to reach the peak of power, he entered the palace to become an eunuch and endured humiliation and lived a life of silence.With the background of the palace struggle, the fate of the three people is intertwined, and a tragedy is brewing under the contradictions and conflicts between love and power, passion and hatred.]