Modern surgeon Su Yunshang unexpectedly transmigrates into the body of the daughter of a disgraced official in ancient times. With a medical-space System hidden in her ancestral jade pendant, she fights for survival in the perilous imperial harem. From a lowly laundry maid to the emperor’s personal physician, she uses modern medicine to unravel palace intrigues and treat the emperor’s chronic illness. She also uncovers the truth behind her father’s wrongful conviction twenty years earlier and the mystery of the Medical Compendium of Strange Diseases, left behind by another transmigrator. When the dragon-patterned blood jade resonates with her pendant, her fate becomes entwined with that of the stern Emperor Xiao Jinyan. Through contests at the Imperial Medical Academy, rescues in epidemic-stricken areas, and a concubine’s fake-pregnancy scandal, she challenges traditional medicine with penicillin and acupuncture, rising to prominence through compassion and skill. From the Cold Palace to the throne room, guided by the secrets of the blood jade and the Merit System, she writes an immortal legend of a phoenix ruling the world.