After her parents died, Xue Lai struggled to survive with her younger siblings under the bullying of her grandmother and second uncle. When food ran out, she accidentally opened a modern passage, trading for food to save her siblings. After dividing the family property, she took her siblings south, saving a wandering doctor, Qin Guanyue, and the heavily injured Prince of Northwest along the way. Utilizing cross-realm trade, she exchanged ancient products for modern food and medicine to help the prince suppress rebellions and defend the city. Her second uncle's family fawned on powerful figures to make trouble, but she defused each of their schemes. Ultimately, the prince pacified the realm, and Xue Lai opened shops to provide disaster relief, was ennobled as a marchioness, and protected peace in the region.