Lin Banxia, a geological exploration specialist, transmigrates into the body of a woman condemned to exile. She voluntarily chooses to marry Gu Ye, a military household member assigned to guard an abandoned kiln. Drawing on her professional expertise, she discovers an underground vein of combustible black stone and develops improved, safer stoves with proper smoke ventilation. Breaking the charcoal merchants' monopoly, she saves ordinary people and border troops from the bitter winter. Together with Gu Ye, she roots out corruption and clears unjust accusations. Ultimately, she uses the wealth of the underground fuel veins to bring warmth and prosperity to the world, finding true happiness and a lifelong companion along the way.