Shen Tieyi, a peerless swordsman, retired from the martial world and became an old fisherman. But one day, Shang Jingzhe, the posthumous son of the enemy he had personally killed, found him aboard his lonely boat. The young man did not draw his sword or seek revenge. He had only one question, meant to pierce the heart: “Did my parents know they were guilty?” Amid a series of deadly pursuits across the islands and battles of wits, the two went from enemies to allies. With his “sword that does not kill” and the conviction that “the art of war is to end war,” Shang Jingzhe repeatedly turned certain death into survival, forcing the martial world’s greatest fighters to retreat. As remnants of the old era meet the sparks of a new one, can the two join forces to pierce through this decaying martial world? The answers lie in the cold waters of the Han River.