Fang Ming, a top wilderness survival expert, transmigrates into the body of the Sixth Prince and immediately finds himself exiled to a remote island alongside 999 female prisoners. Faced with a seemingly hopeless situation with no food or fresh water, Fang Ming uses his advanced modern knowledge and technology to turn things around. He teaches the female prisoners how to purify seawater, forge iron, make salt, reclaim wasteland, and build a city. Step by step, he transforms them into an army that guards the seas: a cold and beautiful female general commands the troops, a physician's daughter practices medicine, and a wealthy official's daughter manages the finances. He then recruits refugees and develops agriculture and industry on a grand scale. When ruthless pirates threaten the island, Fang Ming creates gunpowder and bronze cannons to fight back. Ultimately, he establishes a maritime empire of his own.