A blind boy named A Mo possesses extraordinary hearing and uses his ability to detect locations by sound to outsmart the village children. He is taken as a disciple by Old Chen, a reclusive cultivator, and accidentally unseals A Shuang, a sharp-tongued sword spirit who has been sealed away for three thousand years. Alongside the sword spirit, he joins the Qingyun Sect and awakens a holy-grade lightning spiritual root, stunning the entire sect. He humiliates arrogant disciples but also attracts a thousand-year-old pursuit by the Xuantian Sect. With one man and one sword, both sharp-tongued yet united at heart, he carves out a path to rise as a blind sword immortal amid deadly dangers.