Yang Fan has always been treated as a fool by the villagers, cared for by the widow sister-in-law Taohua. In a conflict, Yang Fan was injured in the head by Liu Laosan, and accidentally awakened the perspective sea system, since then recovering his sanity. To help sister-in-law Taohua repay a debt of 1,200 yuan, Yang Fan used the system to see through the seabed, catch tidal goods and dig up precious seafood, go out to sea to catch sea bass, survived a narrow escape in the storm relying on the system navigation, and promptly drove away Liu Laosan who came to the door to make trouble. After making a profit, the system upgraded, Yang Fan bought a fishing boat to go fishing, caught a large number of golden thread fish, and found a Ming Dynasty shipwreck on the seabed, salvaging a complete blue and white porcelain. Yang Fan thus started the counterattack road of tidal catching and treasure hunting.