A pure heart is free from the fragrance of plum blossoms and has nothing to do with an affair. Once you return to the crane, you will live a long life. Whose poem is this?

First of all, it's not a poem, but a poem at most, which belongs to Yuanqu. Similar to Qiu Si in Ma Zhiyuan.

Look at the content again. The first two sentences are plum blossoms, and the last two sentences are white cranes. It's okay to write together, but the two sentences are not related, and the artistic conception is different, which is abrupt and unnatural.

So upstairs looks like an essay, I agree.