Set against the backdrop of ancient Goryeo, Dan Hwal is transformed into a Bulgasal—a mythical, blood-drinking creature incapable of dying—when a mysterious woman sacrifices his mortal soul. Cursed with immortality and an agonizing thirst for human blood, Hwal spends six hundred years wandering the earth with a singular, consuming obsession: hunting down the reincarnated woman who ruined his life. Driven by an unyielding desire for vengeance and the desperate hope of reclaiming his stolen soul to finally find mortal peace, his path is fraught with eternal torment.In the modern era, the woman who cursed him is reincarnated as Min Sang-un. Having suffered a tragic childhood marked by a monster attack that claimed the lives of her mother and twin sister, Sang-un lives in hiding under a
false identity, terrified of the supernatural forces hunting her. Alongside her fiercely protective younger sister, Sang-un tries to build a semblance of normalcy while desperately seeking a way to break the ancient curse.When Hwal finally tracks Sang-un down, the dynamic shifts dramatically. Instead of exacting immediate revenge, Hwal discovers that Sang-un has no memory of her past life as a Bulgasal. Complicating matters further, other mythical creatures, known as *Pulgasari* and ghosts from their shared history, resurface in the modern world. Among them is Ok Eul-tae, a wealthy, powerful hidden Bulgasal who has secretly manipulated society for centuries. Unlike Hwal, who despises his immortal curse and feeds only on animal blood, Eul-tae revels in his monstrous nature, feeding on human souls and pulling the strings of modern tragedies. Eul-tae wants Hwal eliminated, viewing him as the only threat to his supremacy.As Hwal protects Sang-un from Eul-tae and other pursuing spirits, a fragile, complex bond forms between the hunter and his prey. Long-
buried memories begin to resurface, revealing a shocking truth: their connection stretches back far beyond Goryeo, rooted in a tragic cycle of love, betrayal, and sacrificial guilt. Hwal learns that Sang-un’s past self did not curse him out of malice, but out of a desperate attempt to protect him and others from a greater evil.The narrative culminates in a high-stakes confrontation against Eul-tae. In the explosive finale, Hwal realizes that true redemption requires sacrifice. To finally break the centuries-old curse, protect the woman he has grown to love, and put an end to the bloodshed, Hwal takes his own life by drinking Eul-tae's corrupted soul and burning to ashes. Ultimately, Hwal’s tragic sacrifice allows Sang-un and the other reincarnated souls to finally live peaceful, mortal lives, free from the crushing weight of immortality.