During the Yuanyou period of the Northern Song Dynasty, Shen Mu, an orphan from the Western Army, walked thousands of miles alone into Bianjing carrying a simple sword, an iron plate, and a secret letter. The letter is related to the life and death of a hundred thousand soldiers, but he is involved in the huge undercurrent of the court and the rivers and lakes. The map of mountains, rivers, and the country reappears in the world, and the fate of the old party's upstarts, the martial arts supreme, the son of the clan, the orphan girl who has been exterminated... The fate of everyone intersects on a rainy night. He gradually understood that the biggest enemy in the world was never at the border. Besides temples and rivers and lakes, there is a third way: the ultimate in martial arts, not to kill, but to protect. The foundation of a country is not weapons and weapons, but the human heart. A martial arts novel that will make you believe in the power of "protection" again.