"Pear blossoms reflect poplar trees, which are all places in where will you go" means: standing under pear trees and poplar trees, my eyes are all white, and my heart is full of where will you go, which describes the sad mood of grave-sweepers. This poem comes from Bai Juyi's Cold Food and Wild Hope, which describes the grave sweeping in the Qingming Festival and vividly depicts the poet's homesickness.