Jinyue Mountains and Rivers

She was a medical woman in troubled times, but she used her account books to figure out the weaknesses of the world's great men. She doesn't fight for power or take sides, she just wants to provide a prescription for survival for the people in the war. But when the favor she owed turned into a dead debt, when the silent shadow of the knife blocked her from the murderous intention of the entire dynasty - she realized that some debts could not be settled.