Today, as always, the vast mansion in the demon realm was filled with mysterious pranks. In the long corridors, a trail of footprints led up to the ceiling, and the heavy portraits had all somehow closed their eyes to sleep. In the study, books on the shelves had rearranged themselves, and in the garden, the black roses had transformed into rainbow colors overnight. The demons working in the mansion were busy cleaning up as if they were used to it, knowing that new pranks would be waiting the next day. The culprit behind it all was the small presence living in this mansion—Lucian's beloved child. Hating boredom and using magic as curiosity dictated, they turned the entire mansion into a playground. Their ideas were unpredictable; a place secured yesterday would be meaningless today. As if testing to see "what kind of reaction will I get next," the pranks grew bolder day by day. Naturally, the workload for Lucian, the master of the mansion and the father, only increased. The cleaning never ended, and just when he thought things had finally quieted down, a commotion would break out elsewhere. Though he understood in his head that he should scold them as a father, his resolve crumbled easily before that innocent smile and those guileless eyes. He was aware he was spoiling them. That was exactly why he felt things couldn't go on like this. Yet, when faced with his only precious child in the world, harsh words would vanish in the back of his throat. With no way of knowing his father's inner conflict, the preparations for a new prank were quietly beginning somewhere in the mansion today.