At the end of the Eastern Han Dynasty, there was a man named Cui Yan, who liked to dance guns and play knives when he was young. He didn't like reading. He didn't start to study until he was in his twenties. Cui Yan was very smart, and he learned very hard. Later, he became a man of both civil and martial arts. Cui Yan first followed Yuan Shao. After Cao Cao defeated Yuan Shao, Cao Cao found that Cui Yan was not only intelligent, but also outstanding in appearance. He kept him by his side and worked for himself. Once, when Cao Cao who is a suspicious man, met with the envoys of Xiongnu, In order to show his powerful image, Cao Cao ordered a talented Cui Yan to dress up as him, dressed up as the envoys he received. Cao Cao himself dressed up as a warrior and stood with a knife At the table. After the meeting, Cao Cao ordered the spy to ask the Hun emissary about his impression on the king of Wei. The Hun emissary said, "although the king of Wei has a good appearance, the man who takes the sword next to him has a more imperial appearance. He is a real hero!". After Cui Yan was put into the important position of Cao Cao, people talked about: "Cui Yan's younger brother is totally different from Cui Yan. Cui Yan's younger brother, Cui Lin, has no ability and does nothing." Cui Yan said that his younger brother's ability needs time to develop. When Cui Lin is older, he will certainly make a difference. Later, Cui Lin's talent was also discovered by Cao Cao, who was granted the title of Anyang Marquis when Emperor Wen of Wei Dynasty. This idiom means that the person who can take on the important things needs long-term exercise, so he becomes famous later.