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Traveling through the Tang Dynasty, he became the prince Li Chong who was secretly raised by Li Shimin. Li Chong didn't know that his father was Li Shimin, so he complained to his father about the current emperor whenever he had nothing to do. "Dad, if I were Your Majesty, I would use all kinds of tricks to introduce new high-yielding crops and develop artificial fertilizers. This is practical knowledge and can solve the problem of increasing population and limited arable land, so that the people of the Tang Dynasty can always have enough to eat. If they have enough food, they will not rebel. Look at the high-yielding potatoes and Champa rice in my son's manor, which is proof!" "Dad, if I were Your Majesty, I would not send the princess to marry, let alone spread the farming technology to make Tubo bigger. Instead, I would divide and assimilate them while they are still ignorant, and finally change their roots and return to their roots. Then our country, the Tang Dynasty, will surely maintain its power forever!" "Dad, if I were your Majesty, I would open up the sea and make the Tang Dynasty an empire on which the sun never sets. Look at my son's "Comprehensive Map of Kunyu and All Nations". This is America, with gold everywhere, and this is Europe, with countless fertile fields!" ... Therefore, many years later, Li Shimin said to Changsun Wuji and others: "I have decided to make the prince Li Chong, who I have been raising in secret, the crown prince! The Tang Dynasty will definitely become more powerful under the rule of this son!"