The heroine Yiluo lived happily with her mother Shangguan Luyun when she was a child, until she saw her mother die in front of the poisoned wine given by the emperor when Yiluo was 5 years old. Before her death, her mother told Yiluo that her father was the emperor and that she had a twin sister in the palace. Yiluo is determined to avenge her mother and receives daily martial arts training from her mother's sister Shangguan Luxia. Twenty-year-old Shangguan Yiluo sneaked into the palace and pretended to be her sister, the princess. Yiluo entered the palace, met the very gentle Concubine Ning, and selected her consort, Xiao Chen, and got to know her "father" better.
What is life like in the palace? What is the ending with Xiao Chen? When Yiluo raised his sword and prepared to take revenge, a man told Yiluo a secret that had been hidden for more than ten years...