昔我往矣杨柳依依今我来思雨雪霏霏
[xī wŏ wăng yĭ yáng liŭ yī yī jīn wŏ lái sī yŭ xuĕ fēi fēi]
From an ancient poem, it means 'In the past, when I left, willows waved gently; now as I return, rain and snow fall heavily', evoking nostalgic and melancholic feelings about change and time passing.