Dachu and Beirong have been at war for three years. Su Watang, an orphan of a medical family, was falsely accused of "collaborating with the enemy and poisoning soldiers" because of his family, and became the last medical officer of the Dingbei Army. She concealed her knowledge of toxicology and surgery, and used rags as bandages and broken arrows as knives on the battlefield, treating wounded soldiers with "the cruelest hands and the coldest mouth". The cold-faced general Xiao Chengyan noticed her due to the frequent occurrence of strange diseases in the army. From suspecting her "poisoning" to being forced to cooperate to defeat the epidemic, the two of them uncovered the truth about the injustice done to the doctor during the crises such as poison arrow traps, poisoning of grain and grass, and the enemy's manipulation. It turned out that the real poisonous conspiracy was hidden in the double calculation between the Great Chu Court and the Beirong Royal Court. Su Watang used medicine as a blade to carve out a way out in the borderland of blood and fire, and finally used a "Battlefield Treatment Strategy" to rewrite the traditional Chinese medicine system in the military, reining in the horse side by side with Xiao Chengyan, and ensuring peace in the borderland for a century.
