Literature Reference: 昔我往矣，杨柳依依。今我来思，雨雪霏霏。行道迟迟，载渴载饥。我心伤悲，莫知我哀！—— 《诗经·小雅·采薇》 When I set out long ago, fresh and green was the willow. Now as I turn back, snow and rain are falling. Slowly I journey, thirsty and hungry. My heart is filled with sorrow, but none know my grief! Source from 'The Book of Songs · Xiaoya · Caiwei'.