When we were young, we all had a world in our hearts. In that world, our tasks were just to run through long mornings, stay up unscrupulously until dawn, and push the class teacher and counselor to death to beat the boss, who is called a high-level math boss. We could not think about anything, stop and not move forward. We didn't have to worry about salary and pension insurance, and we didn't have to worry about endless daily necessities. However, when the world slowly collapses, and when the bright future that the teacher carefully described is overwhelmed by reality, will we also become small and smooth, and finally submerge in the tiny dust of thousands of changes?