In a fishing village along the bay in the 1980s, Lu Changhe loses his beloved wife and awakens the Sea God's Ten Thousand Beasts Chart, gaining multiple extraordinary ocean abilities. He can locate schools of fish, predict the weather, see through the structure of objects, and uncover hidden treasures and dangerous currents beneath the sea. He purchases two old boats, Qinghe and Wanghe, and builds a fishing fleet, opens a dried-fish workshop, and prepares to establish a tidal-flat marine aquaculture business. After meeting Gu Mingzhu, the female owner of Haitang Restaurant, he gains access to the high-end seafood market. He also rescues Lin Xiulan, a fisherman's daughter. After discovering and reporting an ancient shipwreck to the authorities, he secures a supply contract for a hundred-table banquet in the provincial capital. Lu Changhe remains committed to respecting the ocean and releasing small fish rather than catching everything. While protecting the younger sister and children his late wife left behind, he builds a thriving fishing and trading business, advancing both his family life and career.