As Ancient China's war-torn kingdoms compete for power, a deadly and alluring struggle unfolds in the King of Ding's seraglio. Ninghu's family is determined to secure her place as future Queen in order to gain King Xun's favor, but he shows no interest in his concubines.
Refusing to accept a life of neglect, Ninghu disguises herself as her powerful brother's eunuch servant. Upon entering the Scarlet Palace, Lingyu, King Xun's favored eunuch, suspects her true identity and begins to investigate.
After Lingyu's original servant's mysterious death, Ninghu becomes his personal servant in an attempt to get closer to King Xun. As their attraction for each other grows, King Xun remains absent from the palace. Has Ninghu fallen for Lingyu, and could he feel the same?