The top assassin "Gu Hong" who lost his memory lived in seclusion in a small town in the south of the Yangtze River and made a living by forging swords. However, his peaceful life was completely broken when he rescued Lin Qingci, a court lady who was being hunted. In order to protect Lin Qingci, Gu Hong was forced to regain his martial arts skills and was involved in the conspiracy vortex between the imperial court and the Jianghu "Tianji Pavilion", and found that he was actually the "first blade" of Tianji Pavilion's defection. Every flashback he had pointed to a cruel truth: the tragedy that caused his amnesia seemed to be inextricably linked to Lin Qingci's family. In the repeated torn between love and blood feud, Gu Hong must face the ultimate hunt of the master of Tianji Pavilion, and in the final showdown, choose whether to complete the "order of extermination" issued by the master, or to cut off the past and protect the people in front of him. He finally realized that "the sword is for protection, not for killing", and at the cost of abolishing his martial arts, he disintegrated the conspiracy, hid in the market with Lin Qingci, and completed his redemption from a murderous weapon to a human being of flesh and blood.
