The Origin

Koo Do-kyung, heir to a vampire bloodline, is tormented by an incurable, madness-inducing curse.

Desperate to save her grandmother, Han Si-yoon takes a high-paying job at Dowon House—only to receive a chilling offer: trade her blood to solve all her problems.

Her choice triggers a dangerous power struggle within the family, entangling her with ruthlessly ambitious rivals and forcing her to face a fate centered on a single mystery: Why her blood?