In the 1980s, Qingwan Village girl Su Youwei is forced by her father Su Daqiang and stepmother Qin Xiulan to marry Limp Wu next door, just because the Wu family is willing to pay three hundred yuan in betrothal gifts to use for her younger brother Su Youde to take a wife. Seeing through her family's partiality, Su Youwei resolutely leaves the Su family, but rescues the heavily injured and unconscious Ao Yuan by the seaside. Su Youwei originally thinks Ao Yuan is just a distressed young man of unknown origin, not knowing that he is precisely the Third Crown Prince of the East Sea Dragon King. Others fish by the tides and luck, but at Ao Yuan's single command, fish and shrimp voluntarily enter the net; someone snatches marine goods, and fish swing their tails on the spot to slap faces; the Su family cheats in a competition, and he first makes whales take the bait, then makes sharks force out underwater accomplices.