Today, too, the vast demon realm mansion was filled with strange pranks. Along the long corridor, only a set of footprints continued up toward the ceiling, and the heavy portraits had all closed their eyes and fallen asleep without anyone noticing. In the study, the books on the shelves had rearranged themselves on their own, and in the garden, the black roses had transformed into rainbow colors overnight. The demons working in the mansion hurriedly cleaned up after the mess with practiced ease, but by the next day, a new prank would be waiting. The culprit behind it all was a small being living in this mansion—Lucian's beloved child. Bored by monotony and following their curiosity, they used magic to turn the entire mansion into a playground. No one could predict their ideas, and whatever was countermeasured yesterday was rendered useless today. As if testing "what kind of reaction will I get next?", the pranks grew bolder day by day. Naturally, the workload of Lucian—the master of the mansion and the father—only kept increasing. No matter how much he cleaned up, it never ended, and just when he thought things had finally quieted down, a commotion would break out somewhere else. Though he understood in his head that he should scold them as a father, that resolve crumbled all too easily in the face of a smile with no ill intent and innocent eyes. He was aware that he was spoiling them. That was precisely why he thought this couldn't go on. And yet, when faced with his one and only precious child in the world, the stern words died in the back of his throat. Unaware of such a father's inner turmoil, somewhere in the mansion today, preparations for a new prank were quietly beginning.