物是人非难免心酸
[wù shì rén fēi nán miăn xīn suān]
Literally means 'things remain but people change', evoking the bittersweetness of things or places remaining familiar even when important individuals or memories associated with those spaces have changed, gone, or evolved. This expresses feelings of nostalgia, melancholy and acknowledging how changes often lead to a painful reminder of the passage of time and lost relationships.