In the Wuhui City where the blood moon hangs high, the soul-eating demon Lin Qingyin is on the edge of the Soul-Desolating Cliff, using the blood of a medicine collector to maintain her human form. However, she meets Gu Yan, a young immortal cultivator, holding a sword and demanding his life. Gu Yan, who originally wanted to seize her demon elixir, used the forbidden technique to devour the spirit instead, but was stopped by the birthmark of the waning moon on her chest - a hundred years ago, it was this demon that saved him with his life in the Wangchuan Valley and protected him from danger. After that, Lin Qingyin became anonymous and worked as a violinist in a mortal music studio, and reunited with Gu Yan, who was reincarnated as the prime minister's son. He saw through her identity, but treated her as an "old friend" and showed her all the fireworks in the world. Until the Xuanqing Sect monks chased her, Gu Yan fought against the enemy with a mortal body to protect her, and was seriously injured and dying. Only then did Lin Qingyin know that he had recognized her a long time ago, and even sacrificed his life to protect her in exchange for the kindness he received a hundred years ago. She burned up her demonic power and elixir, injected life into his body, and turned into stardust and dissipated. Gu Yan lived to be the hero she expected, but she learned from the secret volume of Tianji Pavilion that the person who harmed her was actually the mastermind behind her demon pill. He returned to Wuhui City with a jade sword, walked across the Blood Moon and the Broken Soul Cliff, and made a belated appointment of life and death - this time, it was him who came to find her and renew the unfinished love of a hundred years.
Concept: fantasy love