After surviving for ten years in a post-apocalyptic world, Su He transmigrates into the body of a kitchen maid sentenced to exile in the South Sea for her master's crimes. Refusing to choose a respectable, wealthy household, she insists on marrying Yan Zheng, a tough, scarred warrior. Armed with her water-based supernatural ability and survival wisdom from the apocalypse, she gathers precious treasures along the shore and discovers riches in the deep sea. She escapes a deadly sea-sacrifice conspiracy, withstands a once-in-a-century tsunami, builds docks and constructs revolutionary deep-hulled ships, and crushes the monopolistic merchant guilds. She ventures across the oceans, expands into new territories, and brings back high-yield crop varieties. Ultimately, she is bestowed the prestigious rank of First-Rank Imperial Merchant and Noble Lady. Together with Yan Zheng, she builds a formidable maritime empire, completing her incredible rise from condemned slave to ruler of the seas.