One day, when Chen Jingrun was having lunch, he touched his head and said, "Oh, my hair is too long. I should get it straightened out quickly, otherwise, if people see it, they will think that I am a girl." So he put down his job and ran to the barber shop.

There are many people in the barber shop, and everyone gets their hair cut next to each other. The brand Chen Jingrun took was the small brand No. 38. He thought: It's still early for my turn. Time is so precious, I can't waste it in vain. He hurriedly walked out of the barber shop, found a quiet place to sit down, then took out a small notebook from his pocket and memorized new words in foreign languages. After memorizing it for a while, he suddenly remembered that when he was reading a foreign language in the morning, he didn't understand something. If you don't understand something, you must understand it. This is Chen Jingrun's temper. He looked at his watch. It was only half past twelve. He thought: Go to the library to check it out first, and then come back before you have time to get a haircut, so he stood up and left. Who knows, not long after he left, it would be his turn to get a haircut. The uncle barber shouted loudly: "Number 38! Who is number 38? Come and get a haircut!" Think about it, Chen Jingrun is reading in the library, can he hear the uncle barber calling number 38?

After a while, Chen Jingrun understood what he didn't understand in the library, and then happily walked to the barber shop. But he passed by the foreign language reading room. There were all kinds of new books, which were very nice to read. He ran in and read a book again. It wasn't until the sun went down that he remembered about getting a haircut. When he touched his pocket, he saw that the small sign with the number thirty-eight was still lying there. But what's the use of him coming to the barber shop? This number has long been outdated.