Why is Li Shangyin a sentimental and hazy poet in the late Tang Dynasty?

Li Shangyin is a famous poet in the late Tang Dynasty, and he can be said to be a master of writing misty poems. In the whole Tang poetry, whenever vague poetry is mentioned, we immediately think of Li Shangyin and Li Shangyin's Untitled Poetry. Li Shangyin's vague poems, "always because he refuses to spit a straight word, his throat is blurred, or this or that, intermittent, so-called good at burying his thoughts." [1] He didn't express his feelings directly, but deliberately buried his thoughts and suppressed his emotions. Li Shangyin's poems are numerous, such as Jinse and Untitled (last night's stars, last night's breeze), and the well-known Jia Sheng, Huaqing Palace and Han Gong Ci, etc., with obscure poems and obscure themes. Few of his poems are straightforward, frank and lively, but most of them have realized poetic twists and turns in a short space with unique ideas, and through the creation and combination of images, they have hinted at the situation and entrusted their feelings, making the meaning of the poems extremely beautiful. His poetry has unique artistic achievements, novel ideas, gorgeous words, rich imagination, rigorous composition and touching style. It is no exaggeration to say that in the history of China's poetry, his achievements in hazy and beautiful poetry are unparalleled.