Pearl diver Su Hai Zhu finds a three-and-a-half-year-old girl named Mo Mo by the sea. She wears a conch shell and can understand the voices of the ocean and the pearl mother. Mo Mo predicts the tide in advance, helping the Su family harvest a large batch of pearls. Evil pearl bosses Wang Zhu Tou and middleman Liu Qi covet the pearls and repeatedly scheme to harm them. Su Hai Zhu joins forces with Boss Wan to escape the village, obtains official certification, and leads the whole village to try artificial pearl farming. The villains constantly spread rumors and poison the ponds, all of which are resolved by Mo Mo's special abilities and the villagers. Mo Mo also finds a miraculous medicine to cure the leg injury of Su Hai Zhu's husband, Chen Lang Ping, and warns of the spring tide to preserve the pearl farming pond. After the villains' crimes are proven, they are punished by the officials.