背影再美也只是背影
[bèi yĭng zài mĕi yĕ zhĭ shì bèi yĭng]
'No matter how beautiful a back view is, it is still just a back view'. The user may express the sentiment of not lingering on past events. It conveys an attitude of looking forward and valuing current presence rather than dwelling on memories of things that aren't tangible.