Fisherman Su Ming is betrayed by his childhood friend Zhao Qiang and his apprentice Gu Nian, who cut his safety rope and send him plunging into the deep sea. By chance, he saves Ao Ling, the Dragon Princess, and from then on gains the ability to recognize every hidden treasure beneath the sea. Long Qianyun, a seafood tycoon from the provincial capital, covets his secret and joins forces with the two traitors to cut off his supply sources, block his provisions, and lay traps at sea. Teaming up with Chu Yuqin of Yunhai Hotel and boat owner Lin Wanqiu, Su Ming overcomes one crisis after another with Ao Ling's help. In just three days, he catches a thousand jin of premium seafood, helping Yunhai secure a place in the finals. Zhao Qiang's evil deeds are exposed, and the ultimate showdown for the title of King of the Sea is about to begin!