昙花一现旧梦生
[tán huā yī xiàn jiù mèng shēng]
Tan Hua Yi Xian Jiu Meng Sheng (An Ephemeral Flower Blooming Brings About Recurrence Of Old Dreams) relates to short-lived experiences, beautiful moments that last only for a fleeting second but can invoke memories of dreams from long ago that reoccur because of current events.