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"This copper needle, if you save one person, you will die." Lin Xiaoman, a medical student who is always laughed at for her height, has a secret - the lotus scar on her left shoulder and the copper needle given by her grandfather can sew together time and space; When an accident in an anatomy class stained her family's copper needle with blood, she actually traveled to a sacrificial scene in the Spring and Autumn Period. From the medicine boy to Mrs. Xiaoman, she: Use boiled vinegar instead of disinfectant water (accused of wasting food); Taught Bai Qi soldiers to use urine to wash battle wounds (called sorcery); Hiding the Mafei Powder formula for Hua Tuo, but it changed the ending of "Qing Sang Jing". Every time a historical figure is saved, another person dies in his place. When the copper needle finally pointed at herself, she understood what her grandfather said: "Xiao Man is not a famous person, but a doctor who always has insufficient knowledge." "Any way of acupuncture must first cure the spirit - now, what should she do?"