Qin Chongsheng, a good-for-nothing fisherman in his past life, returns to 1980. He activates the Ocean Overlord System, owning a fishing boat that can be upgraded infinitely. In this life, Qin Tian thoroughly reforms, attentively protecting his wife Chu Niansheng and their three daughters. Led by the system to detect and salvage large yellow croakers, yellowlip fish, sea cucumbers, and other precious seafood, he returns fully loaded again and again. Constantly upgrading his fishing boat and fighting malicious enemies, Qin Tian strives to make money with ocean resources, protects his family, and step by step transforms from a fishing village good-for-nothing into a maritime tycoon.