在怀念怀念以前的怀念在回忆回忆曾经的回忆
[zài huái niàn huái niàn yĭ qián de huái niàn zài huí yì huí yì céng jīng de huí yì]
'Recalling the memories of missing the past, recollecting the recall of former times'. It expresses deep nostalgia for good old days with a little exaggeration, implying that someone feels so much nostalgia about things or people of the past.