The human girl Eve, in order to save her brother Noah who was poisoned by the 'Silver Poison', is forced into a complicated entanglement with Cain, the progenitor of the vampire clan. What starts as a simple deal for mutual benefit gradually evolves into a story full of love and hate. Eve, desperate for the purifying silver that Cain possesses, is willing to trade her dignity for it, only to discover that Cain is hiding the pure-blood vampire Lia asleep in his heart, seeing Eve merely as a blood servant and a tool for his desires. During this time, Eve faces betrayal from her suitor Evan and all sorts of schemes and harassment from Lia, finding herself in danger multiple times. Meanwhile, Cain gradually softens as he spends time with Eve, moved by her resilience and her sacrifices for her brother, and his feelings shift from using her to truly loving her. After Lia awakens, driven by jealousy, she launches a frenzy of revenge against Eve, forcing her to work as a hostess in a club and even bribing others to try to destroy her. When Cain learns the truth, he finally comes to terms with his own heart, breaks ties with Lia, and after many twists and turns, finds Eve, who has fled far away. Dropping the pride of the vampire progenitor, he humbly professes his love for her, ultimately winning her over. With Noah’s blessing, the two finally come together.
