Modern young woman Su Yun travels back in time to ancient China, where her father has died in a shipwreck, leaving her with a dilapidated cargo ship and a mountain of shipbuilding debts. Her uncles collude with Heng Tong Shipping to trap her in a predatory loan scheme, hoping to seize her family's vessel. Su Yun boldly wagers before the court that she will repay the entire debt within one month and recruits Huo Zheng, a skilled navigator with exceptional martial abilities, as her first mate. She revolutionizes the shipping industry with consolidated cargo compartments, standardized freight services, and last-mile delivery. Despite her competitors' ruthless price wars, she breaks their monopoly over the waterways. After securing a major imperial medicinal-herb contract, she personally funds the transportation of relief grain and earns an imperial commendation. She then establishes Si Tong Express. After standing by her throughout her journey, Huo Zheng presents her with a partnership contract founded on equality and mutual commitment. Together, they transform ancient canal shipping through modern logistics innovations.