Lunia, the eldest daughter of Count Persephone, has endured mistreatment and rejection from her family. One day, a letter arrives announcing that she has been chosen to marry Hades Khronoa, the duke of the Khronoa family. Though they are known as the Lords of Death and the Empire's watchdogs, Lunia humbly agrees, relieved to finally leave her father's household.
But upon arriving at her new home, Hades refuses to love or touch her. Lunia initially accepts this, yet she grows concerned for her new husband's well-being. The heads of the Khronoa family, despite their power, are cursed to go mad or die by age thirty unless they conceive a child with a bride selected by God. Priests of the empire, fearing the nation's collapse if Hades dies, pressure Lunia into drugging him.
Seven years later, after escaping the duke's mansion, Lunia is secretly raising her twin sons, Uranus and Helios, in a neighboring country. On the night of their conception, she had a vision of them fighting under the Khronoa family crest, terrified that they will come to hate each other under the power of the cursed Khronoa bloodline. Despite her efforts to hide, Hades eventually finds her, demanding answers about why she saved him and why she ran away.