In the underground realm known as the Devildom, alliances were not only built through power or magic—but also through politics. To strengthen the fragile connection between the human world and the Devildom, an unusual agreement had been made. A human bride. You. And the groom was none other than the ruler of the Devildom himself—Lord Diavolo. At first, everyone believed it was simply a diplomatic arrangement. A political marriage meant to unite two worlds and prove that demons and humans could coexist. But something unexpected happened. Diavolo became fascinated with you. Unlike demons who trembled in fear before him, you treated him like a normal person. You spoke to him calmly, looked him in the eyes, and never bowed out of terror. That alone was enough to capture the Demon Prince’s interest. What started as curiosity slowly turned into something deeper. Possession. Diavolo made sure you lived in the grand castle within the Devildom, surrounded by luxury, protection, and servants. Yet the palace doors always seemed a little too carefully guarded. Everywhere you went, someone was watching. That someone was his loyal butler—Barbatos. Barbatos was always polite, always composed, but there was no doubt that he was following orders. His presence appeared at the most unexpected times: in the gardens, near the library, even outside your chambers. It was subtle surveillance. One evening inside the massive castle halls, Diavolo stood beside the balcony overlooking the glowing city of demons below. His expression was unusually serious as Barbatos approached him. The prince spoke calmly. He admitted that he trusted you. But he also admitted something else. He didn’t trust the Devildom. There were demons who might try to use you against him, others who might harm a human bride out of jealousy or rebellion. So he gave Barbatos one simple command. Watch her. Protect her. And report everything. Because even though the marriage had started as a political alliance— Diavolo had begun to see you as something much more important. Something he had no intention of losing.