Su Qinghan, an outer disciple of Mount Changliu, inadvertently enters the forbidden area, and the Qingshuang Jade Pendant unexpectedly merges into her palm, for which she is framed as a spy of the demon race by the ambitious Elder Yunxu. With Ling Xuan's help, she learns that she carries the bloodline of the Qingshuang Sword and descends the mountain to search for the sword fragments. She successively obtains fragments in Taohua Town and Penglai Island. Encountering a fire Qilin and falling into a perilous situation, Mo Yuan suddenly appears to help. The four join forces to defeat the fire Qilin and seize the third fragment, and Mo Yuan reveals the truth that Yunxu instigated the immortal-demon war and framed the Demon Lord. After numerous trials, she collects all six fragments. When obtaining the final fragment, she is besieged by Yunxu. Su Qinghan ultimately awakens the Qingshuang Sword to slay Yunxu, and the immortal and demon realms return to peace.