As war-torn kingdoms vie for power in Ancient China, a deadly yet beautiful struggle also emerges in the seraglio of King Xun, the King of Ding! To gain the terrifying King Xun's favor, Ninghu's family is determined to make her the future Queen, but King Xun is not interested in his concubines at all. Unwilling to become just another neglected concubine, Ninghu disguises herself as an eunuch servant to her brother Yuanren, the second most powerful eunuch and adviser in the kingdom. However, the moment she enters the Scarlet Palace, Lingyu, the most influential and favored eunuch, suspects that she is a girl and begins to investigate her. Following the mysterious death of Lingyu's original servant, Ninghu decides to become Lingyu's personal servant in hopes of approaching King Xun. However, King Xun is absent from the palace, and as time goes on, Lingyu and Ninghu become increasingly attracted to each other. Could they have fallen in love with each other?!