Source: Biography of Meng Chang in the Book of the Later Han Dynasty. The county did not produce grain, but pearls were produced from the sea. The officials came to the government, reformed the previous abuses, and sought benefits for the people. It had not been more than a year; the pearls returned to Hepu. The meaning of "return" is to return. The pearls of Hepu are back again. It is a metaphor for people who leave and return, or lost things that are found again. During the Eastern Han Dynasty, pearls were produced in abundance along the coast of Hepu County; the pearls produced there were round and large, with pure color, and were famous at home and abroad. People called them "Hepu pearls". The local people made a living by collecting pearls, and exchanged them for food from the neighboring county of Jiaozhi. The income from pearl collecting was very high, and some officials took the opportunity to embezzle and pervert the law, and exploited the pearl people in various pretexts. In order to get more money, they ignored the growth law of pearl oysters and blindly asked the pearl people to fish. As a result, the pearl oysters gradually migrated to the neighboring Jiaozhi County, and fewer and fewer could be caught in Hepu. Fishermen along the coast of Hepu have always made a living by collecting pearls, and few people grow rice. When there were many pearls, the income was high, so it didn't matter if they spent some money on food. Now that pearls were produced less, the income was greatly reduced, and the fishermen didn't even have money to buy food, and many of them starved to death. After Emperor Shun of Han, Liu Bao, succeeded to the throne, he sent a man named Meng Chang to be the governor of Hepu. After Meng Chang took office, he quickly found out the reason why the local fishermen had no food to eat; he ordered the elimination of malpractices, abolished the illegal regulations of exploitation, and prohibited fishermen from fishing and collecting indiscriminately in order to protect the resources of pearl oysters. In less than a year, the pearl oysters multiplied again, and Hepu became a place rich in pearls again.