翘首以盼回首遥望
[qiáo shŏu yĭ pàn huí shŏu yáo wàng]
'Lift the Head Expectantly, Look Back Longingly' illustrates the emotion of anticipating something/someone with great eagerness, yet at the same time harboring nostalgic feelings when looking back at what has been. It conveys mixed sentiments of hope and longing.