只见新人笑哪闻旧人哭
[zhĭ jiàn xīn rén xiào nă wén jiù rén kū]
'Only Hearing the New Ones Laugh, Never Hearing the Old Ones Cry' illustrates feelings associated with seeing others enjoy success or good times (new faces) while those from the past (old ones) have their moments of sorrow being ignored or forgotten.