After his father dies, Lin Haichuan inherits the fishing boat Haisheng and a seafood warehouse. However, his uncle, Lin Dacheng, seizes the boat and pockets the payments for the goods. Just as Lin Haichuan is about to reclaim his property, Lin Dacheng tricks him into going out to sea and kicks him off the boat to silence him. As Lin Haichuan sinks to the bottom of the ocean, he unexpectedly becomes bound to a fish-farming game. In the game, he can buy fish fry, feed them until they grow, harvest sea coins, and extract mature marine fish and pets into the real world. From small yellow croaker and large yellow croaker to red grouper, king crabs, and bluefin tuna, Lin Haichuan continually expands his fish tanks and unlocks coral pools, deep-sea pools, and marine ranches. Step by step, he reclaims his fishing boat, protects his warehouse, and leads his wife and daughter into a better life.