Eun-soo gets unexpectedly pregnant due to a medical mix-up. Her initial shock is short-lived when she discovers the father of her unborn child is the ruthless Mafia King, Gio. Though he is a dangerous man who brutally kills his enemies, Eun-soo's heart begins to waver as she sees Gio risk his own life to shield her and their baby from every threat... Will Eun-soo accept Gio as her baby's father and become the Queen of the Mafia Empire?