The first reason is that although the big city is bitter, living in the big city is the dream of some people, and they are not willing to give up their dreams easily! They think that if they work a little harder they will be able to get through all the hard times and realize their dreams from childhood. These people have set a goal in their hearts since they were young to live in a big city, and they have stayed away from their hometowns not only to realize their dreams, but also to fight for their honor, and if they go back to their hometowns now, they will feel very ashamed of themselves.
The second reason is that big cities develop fast. The second reason is that the big cities are developing fast, which is in line with the young people's idea of pursuing a fast life. The big city is full of goods, where they can buy anything they want and see things they don't often see. And with that even if it was hard, they endured it!
The third reason is that there are many job opportunities in the big cities, and they will always find a job that is to their liking. If you really go back to a small place, life is not so bitter, but there are fewer opportunities, it is really to trap yourself! Such a life is not what most young people want. They prefer the outside world, because it allows them to see more things, learn more things!