The big city is like a huge bearing, and the people in the city are like gears that are constantly turning, with bumps and frictions inevitable. If you are at one end of the city, and he is at the other end, you will always encounter many things, and the bumps and frictions may just be a tragic story in an inconspicuous corner. (This is connected by many short stories. You can also follow the Weixin public account: 7931 Story Station.)