Three hundred years ago, Ling Shuang, the Frostflower Immortal Envoy, sacrificed herself to shield Xuan Yuan, the God of War, from the Nine Heavens Thunder Tribulation. Instead, she was framed for colluding with demons and betraying her country. The man she loved personally stripped away her immortal bones and cast her into the Desolate Bone Demon Abyss, where she was condemned to never be reborn. At the brink of despair, Ling Shuang unexpectedly awakened the power of ancient emberfire. Refining a demonic heart with her immortal soul, she is reborn from the ashes, carrying overwhelming hatred and vowing to make every betrayer pay their blood debt. Former lovers now face each other on the battlefield, a hypocritical junior sister schemes in secret, and the Left Envoy of the Demon Clan watches with predatory intent. Amid layers of deadly plots, a truth sealed away for three hundred years and a tragic, tortured romance slowly emerge from behind a blood-red veil.