During the Southern and Northern Dynasties, there was a man named Jiang Yan, who was a famous writer at that time. Jiang Yan was very talented when he was young. He could write articles and paint. But when he was old, he would always hold a pen and think for a long time, but he could not write anything. Therefore, people at that time rumored that one day, Jiang Yan was sleeping in the pavilion and had a dream. In the dream, a man named Guo Pu said to him: "I have kept a pen with you for many years. It is time to return it to me." Jiang Yan touched his arms and took out a pen. A five-color pen came, so he returned the pen to Guo Pu. From then on, Jiang Yan could no longer write beautiful articles. Therefore, people say that Jiang Lang's talents have been exhausted