Why should the poet take "Fu on behalf of others" as the topic?

Several generations of "Zhegutian"-"Zhegutian" is a epigraph, indicating the form of words; "Fu Dairen", the title of this word, explains the content of this word. There are two possibilities for the title of ghostwriting: one may be a real ghostwriting; Another possibility is ghostwriting. In either case, it is to express the poet's own thoughts and feelings.

Fu on the Last Generation of Partridges is a poem written by Xin Qiji, a poet in the Southern Song Dynasty. * * * two sentences, divided into "partridge day, soft mulberry bud on the stranger" and "partridge day, west Western jackdaw is sad dusk". On the surface, this poem describes the suffering of lovesickness, but in fact it entrusts the political ideal that the poet Xin Qiji can't realize. It is also quite special in style, and it is a beautiful and graceful word of the bold poet Xin Qiji.