白露为霜蒹葭苍苍
[bái lù wéi shuāng jiān jiā cāng cāng]
The idiom 'White Dew turns into Frost amidst Dense Reeds,' quoted from 'Guo Feng' (Odes of Guo) in Shi Jing (Book of Songs), an ancient collection of poems, conveys the idea of love between individuals separated by physical distances but united by affection. This can imply longing or nostalgia for lost love or separation from loved ones, reflecting the deep emotional attachment between people.