When Xion Aijawa's attempt to rescue a cat from a tree ends in death, he accepts a peculiar offer in his dazed state—only to awaken in a magical realm teeming with dungeons and Mana. Transmigrated into the body of an illegitimate Marquis heir, Xion discovers he has merely thirty days before the original owner's curse claims him. Desperation drives him to flee the family estate during a grand celebration, armed only with a cryptic Mall System and dreams of escaping his doomed fate in the distant borderlands. Salvation arrives in the form of tragedy. While attempting another escape, Xion crosses paths with Darius Rael Darkhelm, the brutal Archduke of the North—a man whose unhinged reputation precedes him across the realm. What should have been a fleeting encounter becomes something far more dangerous when the deranged noble recognizes Xion's extraordinary healing power and decides he cannot bear to let him go. Pinned beneath Darius's iron grip, Xion watches a rare smile spread across the Archduke's handsome features. In that chilling moment, he understands that the deranged ruler's affection promises far greater peril than any curse ever could. When Darius's emerald eyes gleam with possessive intent and he whispers a casual proposal of marriage, Xion realizes his struggle for freedom has only just begun—for the Archduke of the North does not accept refusals from those he claims as his own.