After falling into a coma for three years due to a serious illness, Gu Haichuan is thrown out of his home by his unfilial son, Gu Dayong. With the help of his daughter, Gu Xiaozhou, and the fisherwoman Liu Yue'e, he awakens the Four Seas Dragon King Seal and gains the supernatural ability to control the sea. He leads his family to make a living from the ocean, gathering seafood and establishing a processing cooperative. Along the way, he fights the greedy Gu Dayong family and the unscrupulous merchant Zheng Wancai, rescues marine creatures such as the dolphin Treading Waves and a giant century-old turtle, punishes the con artist He Cuicui, and protects his loved ones and the fishermen of Baisha Bay as he builds a successful enterprise.