Xishi's beauty is seen as a blessing to the villagers of Yue - where the best fate for a girl is to marry well and support her family. When Xishi draws the attention of Fanli, the famous young military advisor, he presents her with a rare opportunity: to use her beauty as a weapon; one that could topple the rival neighbouring kingdom of Wu, improve the lives of her people, and avenge her sister's murder. All she has to do is infiltrate the enemy palace as a spy, seduce their immoral king, and weaken them from within.