寻寻觅觅怀念于往昔反反复复沉沦于往昔
[xún xún mì mì huái niàn yú wăng xī făn făn fù fù chén lún yú wăng xī]
Can be interpreted as 'Searching and searching, missing the past, repeatedly falling into the past again and again.' It conveys longing for and nostalgia of old times, suggesting someone deeply rooted in reminiscence and unable to move on.