Sheng Chuyang is the Vampire Princess and only surviving descendant of a human-Blood Clan union, raised in the City of Eternal Night. On her hundredth birthday, during her weakest moment, rebels besiege the city walls while her brother Bai An lies gravely injured. A shadowy figure captures Bai An and demands Sheng Chuyang trade her life for his. She swears a blood oath to never harm her brother again, then tears out her own heart and leaps into the Endless Abyss. Instead of dying, she awakens in a human coffin in Huayang City, having possessed the body of an eighteen-year-old girl who died in a car accident the night before. She escapes the funeral home just as the Vampire Hunters Association, led by the ruthless Bo Chenjing, arrives to investigate.
Bo Chenjing, the feared Sixth Master of the powerful Bo family, takes Sheng Chuyang into custody, suspecting her resurrection is linked to vampire activity. During an interrogation, he discovers she emits no vampire aura but carries the scent of blood, leading him to theorize that vampire abilities transferred to her during the accident. Despite his suspicions, he treats her with unexpected kindness, buying her clothes and food. Sheng Chuyang, needing to return to her brother, decides to leverage Bo Chenjing’s influence while hiding her true identity. She discovers the Crimson Moon Necklace, a royal Blood Clan relic, has fallen into the hands of her stepsister Sheng Qingwei. Upon retrieving it, she attempts to open the passage back to the City of Eternal Night but finds it sealed, indicating her father has fallen into a deep slumber.
Trapped in the human world, Sheng Chuyang navigates a hostile family environment where her father and stepmother plot to steal her mother’s inheritance. She confronts her abusive fiancé, Jiang Songran, breaking his arm at a banquet after he humiliates her. The event is interrupted when a corpse drops from a chandelier, revealing a blood-drained victim, which Sheng Chuyang identifies as a vampire kill. She secretly investigates the scene and is reunited with her guardian, Xi Xingmu, who survived her death through their bonded contract. Xi Xingmu reveals he lost consciousness when she died and has been investigating Bo Chenjing, uncovering his connection to the Rong family, ancient enemies of the Blood Clan. As Sheng Chuyang hides her true nature from Bo Chenjing, who grows increasingly suspicious of her non-human traits, she must survive in a world where discovery means execution, all while searching for a way to reopen the sealed passage and restore order to her kingdom.
