Late at night in Jiangcheng, a strange martial arts auction attracted various hidden masters. Veteran Chu Tian originally came to the scene to find his missing comrades, but he was accidentally involved in a conspiracy to compete for the "inheritance of ancient martial arts". The auction suddenly suffered a bloodbath. In the chaos, Chu Tian rescued the seriously injured mysterious woman Shen Qingci, but she was forced to plant the "Seal of Life and Death" - an ancient forbidden technique that allows people to live and die together.
Shen Qingci claims to be the last descendant of the hidden sect "Tianxuan Pavilion" and holds half of the long-lost "Nine Nether Sword Classic" in his hands. The organization chasing her, "Dark Blade", appears to be a multinational security group, but in fact it secretly collects ancient martial arts secrets in an attempt to create an army of super soldiers.
Chu Tian actually contains a rare "Pure Yang Physique" in his body, and is the only medium for practicing the "Nine Nether Sword Classic". The two were forced to join forces, and under the bustling city, a dark world composed of ancient warriors, supernatural beings and thousand-year-old families slowly unfolded.
From being wary of each other to fighting side by side, from being forced to coexist to relying on each other in life and death. What Chu Tian has to face is not only the major forces chasing Shen Qingci, but also the shocking secret behind his life experience. The car accident that killed both his parents twenty years ago was actually related to the "Xuanyuan Secret Realm", the greatest treasure in the ancient martial arts world.
When modern weapons confront peerless martial arts, and when sincere emotions collide with thousand-year-old grudges, can Chu Tian and Shen Qingci carve out their own path as knights in this steel forest? And will the bond between them, forcibly bound by forbidden magic, eventually turn into unforgettable love, or will it be a curse of mutual destruction?
