南街故人北桥旧人
[nán jiē gù rén bĕi qiáo jiù rén]
Means 'Old Acquaintances at Southern Street, Old Friends at Northern Bridge'. Express nostalgia or reminiscence, referring back to cherished past and unforgettable people from different phases of life, like old lovers and old companions in separate places. It shows yearning and sentimentality for the past.