Ni Yongyao, the eldest son of the formidable Ni family, returns to Hong Kong from New York following his father's mysterious assassination. Transmigrated into a chaotic universe blending iconic Hong Kong crime dramas, he finds his family crumbling under internal betrayal by rebellious elders and external pressure from a corrupt police task force. While his siblings panic, Ni Yongyao remains unnervingly calm, having secretly cultivated connections with figures like Michael Corleone.

Upon his return, he awakens a unique 'Killing God System' that rewards him with gold coins for every elimination, allowing him to summon elite assassins like Storm Shadow and build an unstoppable private army. Facing a web of conspiracies involving triads, dirty cops, and rival gangs, Ni Yongyao decides to stop hiding in the shadows. With cold pragmatism and overwhelming force, he begins to purge the traitors within his manor and dismantle the enemies outside, aiming to transform the Ni family into the undisputed supreme power of the Hong Kong underworld.