酒一杯人已散流年尽
[jiŭ yī bēi rén yĭ sàn liú nián jĭn]
'One cup of wine, all guests gone, all happy times are spent'. This portrays the loneliness and regret after a party ends, all pleasant moments have vanished with other people's departure. One might be drinking alone feeling desolate and recalling good old days.