As soon as a modern girl opens her eyes, she transforms into the cannon fodder of the cold palace, Bai Zhi, and is bound to a cruel survival system: she only has a lifespan of a hundred days, and her yang energy continues to drain. When her yang energy reaches zero, her true form as a fox demon will be revealed, and her soul will disappear. She accidentally bumped into the rumored to be weak King Xiao Jue who was suppressing magic skills alone. The other party immediately noticed the unique yang energy in her body and accepted her as his personal maid.
Xiao Jue seemed to be knocked down by the wind, but in fact, the poisonous demon power in her body was eating her heart day and night. Only Bai Zhi's fox clan's yang energy could temporarily stabilize the injury, and daily close contact would absorb a large amount of her demon power. While Bai Zhi was afraid of being sucked out of her life and wanted to escape from the palace, at the same time, she caught a glimpse of his tolerance and scars hidden under the skin of his illness during the relationship - he lost his mother when he was young, was poisoned and framed by a noble concubine, and was trapped in the deep palace every step of the way.
As they got along, the two became close to each other. Bai Zhi unlocked the memories of her past life and learned that she was the white fox spirit left behind by Xiao's mother. At that time, Concubine Liu had exhausted the fox pills to protect Xiao Jue; the concubine and the exorcist department pressed on step by step, revealing the identity of the fox demon and setting up a killing plan. Bai Zhi no longer just wants to save her life, but chooses to stand by Xiao Jue's side, using the power of the nine-tailed demon to detoxify him, and work together to overturn the concubine's conspiracy and eliminate the troubles in the court.
The medicine and the patient who used to use each other finally broke the barrier between humans and monsters. He ascended to the throne of God and made her the spiritual concubine who protects the country, staying with her every year.
