Yan Shu's "Huanxisha" expresses the author's () emotion, which can be summarized by the idiom ().

In the Song Dynasty, Yan Shu wrote the words "Huanxisha": "There is nothing to do, let the flowers fall, like meeting a face." This word laments the last spring, laments the passage of time, and secretly contains human meaning. It shows the author's deep helplessness in the face of fleeting years, the disappearance of spring and the change of life. This situation can be summarized by idioms (endless change, impermanence, helplessness).