Office worker Su Wan’s fish tank becomes a portal to the Ming era. She links up with navy commander Zheng Yunzhou, who is adrift at sea with three hundred men. She sends supplies to beat hunger, sickness and pirate attacks. He rewards her with treasure, and she strikes it rich. With Su Wan’s historical foresight, Zheng Yunzhou fights political schemes, sea raiders and famine. He proves his innocence back in the imperial capital and reshapes Ming maritime trade.