Eternal night descends, civilization collapses. In this wasteland ruled by the blood clan, humanity is but prey clinging to life. Vivian Bai, a human survivor possessing the rare ability of “mind reading,” ventures alone into the forbidden manor shrouded in mist to save her endangered kin. Awaiting her is her long-lost childhood friend—Selena Yan, now a ruthless vampire lord. “Sign this ‘symbiotic’ contract, and your kind shall live,” Selena's voice cuts like ice. “The price is your blood, your soul, and... your freedom.” Within the manor, as Vivian probes Selena's thoughts, she uncovers a chilling truth: behind those seemingly cruel commands lies a twisted, burning possessiveness. When she discovered ancient family texts detailing the “Curse of Immortality” in the old cellar, an even more terrifying fate surfaced—every hundred years, one of the childhood sweethearts must sacrifice the other by their own hand, or both races would perish. On the night of the crimson moon, when Selena chose to shatter a millennium of cultivation to break the curse, Vivian finally understood: this arranged marriage had never been a shackle, but Selena's love letter transcending life and death. As the blood-stained altar collapsed, she made the most desperate choice—piercing her own heart to let their blood merge completely at the curse's core. As the old world sank beneath their feet, this pair of lovers who transcended racial boundaries would come to understand: in this eternal darkness, only their twisted yet resilient love remained as the final salvation.