南柯一梦天醉欢
[nán kē yī mèng tiān zuì huān]
Translated word-by-word as 'A dream under the South Branch got Drunken Revelry from Heaven', comes from an ancient Chinese allegorical tale 'The Governor of Nanke'(a big empty shell that made ants delusional about power). Generally, the meaning lies within 'all joy is fleeting just like a pleasant dream'.