Rosy enters a cold, contractual marriage out of necessity, expecting a simple transaction. But this union, bound by more than ink—by ancient vows of blood—unlocks a hidden, dangerous world. As lines blur between duty and desire, her stoic husband's true power is revealed, plunging her into a high-stakes game of supernatural politics and lethal family secrets. What began as a simple contract becomes a fight for survival and a passionate, consuming love that demands the ultimate price: her loyalty, her heart, and perhaps her very humanity.