As the global population surged, vampires, now flush with blood, began to be selective about its taste and quality. This ushered in an era where human blood was aged like wine and consumed. Among them, Harry, who was ousted from his position as CEO of the top wine producer Kingston Winery by his own brother, lives in Korea as a blood broker in a small wine bar. One day, a high school girl named Yeonseo visits Harry and, possessing blood of astronomical value, he proposes an exclusive blood donation contract to her. Needing money, Yeonseo accepts the contract and comes under Harry's care, leading to a romance that transcends species...