romotion of sweet potatoes should start from the capital and the two provinces north and south of it.Li Chen had already made up his mind. He said, "This matter still needs to rely on the Liu family's...Chapter 657: Stimulationi asked."In a few days, I will arrive in the capital city," Li Chen said.Zhao Xuanji smiled gently and said, "If Mr. Jing arrives in the capital, please introduce him to me, Your Highness. The old min...