After finally reuniting with her biological family, Su Miaomiao, the true heiress, goes to the countryside. Armed with a medicinal field hidden in her spatial realm and peerless medical skills, she ventures into an underground laboratory at night and exposes an illegal experiment scandal that has harmed thousands. To rescue her aunt-in-law, who has fallen into danger, she travels to the Xishan mining district, punishes her wicked relatives, and treats the miners' lung diseases. She even uses her achievements to secure a fresh start for her aunt-in-law. After returning to the village, she is invited to the capital for saving lives aboard a train. There, she takes on a high-risk operation involving a leading scientific authority and devises a scheme to reclaim the marriage contract for her third brother's former love. Along the way, she saves lives and overcomes one crisis after another, while waiting for Lu Xiuyuan's unwavering promise to defy their differences in social standing and be with her.