Set in Darkfall City where the black market grey transactions are monopolized by several top auction houses, Tilly, the 4-year-old little princess of the oldest and most prestigious Night Owl Auction House, is born with the superpower of "hearing treasures": she can perceive the past of any object and tell its authenticity as long as she touches it. Three years ago, her uncle Vincent, who wanted to seize the position of family head, colluded with the mysterious organization White Gloves that covets the bloodline of ability users, and framed Tilly's father Adrian for embezzlement, which led to Adrian being imprisoned for a long time. Tilly's mother Serena faked her death and went undercover inside the White Gloves for three years to find her husband. After growing up, Tilly exposed the fake Blood-Tear Ruby conspiracy at the re-auction scene, and was appointed by her grandfather Augustus as the next Seal-Keeper of Night Owl. Later, she saw through multiple rounds of conspiracies of the villains with her superpower, found out the full truth of the "Blood-Red Night" incident three years ago, gathered partners of all sides to start the journey to rescue her father. She worked in perfect coordination with her mother who had been undercover for three years, finally smashed the Heart of Ten Thousand Treasures, the artifact that can control the fate of all ability users, brought all the villains to justice, rescued all the imprisoned ability children, and the whole family reunited smoothly. In the end, as the little Seal-Keeper, Tilly announced that the Night Owl will "only sell real treasures, never betray people's hearts", leading Darkfall City to a peaceful new era.
