Li Shangyin's untitled poems make good use of Chinese characters and cold words. What are the advantages?

The first sentence is about yourself, and the second sentence is about imagining each other. "Changing temples" refers to being unable to sleep at night because of painful torture, resulting in the loss of temples and gaunt face, which is what Wu Yun, a poet of the Six Dynasties, said: "Worrying changes temples, crying makes beauty disappear" (Six Poems with Ma Xiaoxi). However, the sentence "Xiao Jing" in Untitled said that when I looked in the mirror in the morning, I was worried about "cloud change" and it was "but worried"-just worried. This vividly describes the spiritual activities of graceful songs, rather than simply describing the fact that youth is consumed by pain. The night is haggard because of pain, and the morning is haggard and painful. The pain at night is because the pursuit of love cannot be realized; The next day I was worried about haggard, hoping to stay young for love. In short, I am haggard with love, but I am depressed with pain. This lingering feeling day and night still shows a painful and persistent heart. The phrase "nocturne" is to put yourself in the other person's shoes and imagine that the other person is as painful as himself. He guessed that the other party would probably suffer from insomnia at night and often sang poems to mourn, but he was so worried that he couldn't get rid of it, so he felt that the environment was getting more and more desolate, the moonlight was cold, and his mood was even more bleak. The hue under the moon is cold, and "feeling cold in the moonlight" reflects psychological desolation through physical coldness. The word "should" is a tone of conjecture and expectation, indicating that all this is my imagination of the other party. The imagination is so vivid that it reflects her eagerness and deep understanding of her lover.