Transmigrated into Snezhnaya's House of the Hearth, Lu Li finds himself among Arlecchino's many "children"—servants of the Third Fatui Harbinger known as "The Knave." His monotonous existence takes an unexpected turn on his 18th birthday when a mysterious System awakens, granting him extraordinary abilities and treasures from across infinite universes. Each month promises new power, but there's a peculiar price: the System activates through an unconventional method that leaves even Arlecchino questioning his sanity. As Lynette, Furina, Navia, and Clorinde become entangled in his bizarre circumstances, Lu Li navigates a world where strength comes from the most unexpected—and embarrassing—of sources.