Jiang Yuan, a concubine who was considered unlucky because of her natural purple pupils, was forced to replace her sister in the palace draft. She thought she would die in obscurity in this cannibal harem, but she was accidentally involved in a bloody "werewolf" game - people died mysteriously every night, with beast-like claw marks on their bodies, but no one remembered the existence of the deceased the next day.
In order to survive, Jiang Yuan had to use the ability of observing words and emotions that he developed as a concubine to deal with the gentle and virtuous queen, the arrogant and domineering concubine, and the uncontested concubine. She gradually discovered that this game was related to the secret of the palace where the late emperor died suddenly twenty years ago, and that her purple eyes, which were regarded as ominous, were the key to seeing through the true face of the "werewolf".
As the game rounds progressed, Jiang Yuan realized with horror: the most dangerous werewolf might be the "guardian" who treated her tenderly during the day. And every identification she makes is not only a matter of personal life and death, but also affects the fate of the entire dynasty...
