Hai Lan, a modern marine biology PhD, transmigrates into the body of a convicted woman exiled to a deserted island. Armed with the Book of the Sea God and her modern knowledge, she gathers seafood, produces salt, and cultivates pearls artificially, transforming Death God's Reef into a maritime commercial empire. She recruits pirates and establishes an armed fleet, while rescuing the amnesiac Imperial Grandson Chu Yuan, who becomes her loyal bodyguard. Hai Lan cleverly uses seafood to quell a so-called plague and bring down a powerful corrupt minister. She then uses an extraordinary supertide to wipe out an entire Western fleet. After being granted the title Lady of the Azure Sea, she rejects the political struggles of the imperial court and joins hands with Chu Yuan to usher in a magnificent Age of Exploration!