Everyone exists in this world, and also perishes in this world; everyone leaves a trace of their existence in the torrent of this world, and the footprints may be forgotten, but they will not disappear; everyone leaves evidence of their own existence in the waves of this world in their own way, either glorious or insignificant; everyone is a witness of their own existence in this world, and a bystander of others' existence in this world; everyone has his or her way of existing in this world... Walking through this world is great and simple!