Lu Chenzhou, an elite submarine soldier, travels back to the 1980s and is rescued from the sea by Shen Yue'e, his widowed sister-in-law. He activates a deep-sea submarine evolution system. Relying on his extraordinary underwater skills, he fights back against the harassment of the Zhou and Lu families, forms a fishing team, establishes a seafood processing factory, and salvages underwater treasures. After overcoming countless maritime dangers, he not only leads the entire village to prosperity but also finds true love with Shen Yue'e, who has stood by him through thick and thin. Together, they take their mother ship toward the vast open ocean.