Ethan, a half-vampire pharmaceutical tycoon, suffers agonizing curse backlash every full moon. Only Lynn, who has rare Rh-null golden blood, can ease his pain. After accidentally forming a blood pact with him in a cave, Lynn leaves and later finds she is pregnant. Struggling with her son’s costly congenital heart disease, she returns to Ethan. As his blood donor, Lynn wins Ethan’s heart. Meanwhile, her gambling foster father extorts her, and Valerie, the fake rich daughter, bullies and frames her. Lynn also discovers she is the true heiress, yet her birth parents keep favoring Valerie. When Valerie kidnaps Lynn with a serial killer, Ethan rescues her and brings all villains to justice. Lynn safely carries her second child, and her son gets proper treatment. After surviving betrayals and life-threatening dangers, Ethan marries Lynn. They resolve all conflicts and live happily as a family of three.