Xu Dong, a lonely medicine boy in the border town of Qingshi, has been silent since he was a child and is called "Xu Mute" by his fellow villagers. In order to save his mentor, Old Man Chen, who was sick, he ventured to Duanhun Cliff to collect medicine. He accidentally fell off the cliff and broke into an ancient cave. He touched the rusty black sword and awakened the Xuanyuan Sword Vein, gaining the talent of cultivating the heaven-defying sword.
With this power, Dong Xu killed the demon wolf to protect the town, and was recruited by the Xuanxiao Sect, the top cultivation sect. However, he was framed step by step by his childhood classmate and sect genius Lin Xiao due to extreme jealousy: he tried plotting, slandered him for practicing evil arts, and framed himself to steal the sect's most precious treasure, the Soul Condensation Pearl. Finally, he was forced to escape from prison and escape into the dangerous forbidden place Netherworld Valley.
In the Netherworld Valley, Xu Dong received the guidance of the ancient remnant soul to refine the sword veins, comprehended the "Silent Shadow", "Nirvana" and other Xuan Yuan Sword techniques, collected all the Xuan Yuan Sword fragments, and formed an alliance with Su Muxue, a disciple of the Zixia Sect, and Qing Lan, an upright disciple of the Xuanxiao Sect. He gradually uncovers the truth about the Xuanyuan Sword Vein - this vein is not an evil force, but a protective vein left by the ancient Xuanyuan Sword Master, shouldering the destiny of suppressing the eternal demon king and protecting the world.
From a mute boy on the border to the successor of the Xuanyuan Sword Master, Xu Dong used silence as his blade and sword intention as his edge. He fought back all the way under the pressure of sects, demon cultivators, and fate, clearing his grievances and liquidating his enemies. Finally, he shouldered the heavy responsibility of protecting the common people and wrote a silent but earth-shattering sword cultivator legend.
