The eldest princess Shen Zhaoning was falsely accused of regicide and was demoted to the cold palace as a slave. However, the scent of medicine on a moonlit night revived her past life memories. Pei Yan, the imperial guard, realized that she was not a creature in the pool, and secretly protected her; Xie Heng of the imperial hospital focused on the blood of Tianshu flowing in her body, and vowed to use her to resurrect the old clan; Liu Jiuniang, the nun of the cold palace, used a needle as a pen to embroider the secret passage to the sky. When the young emperor reads nursery rhymes at night, the murder case in the court resumes. A storm of revenge woven by medical skills, astrology and embroidery is sweeping through the center of imperial power from the humblest corner.
