后来我发现原来只是一个梦
[hòu lái wŏ fā xiàn yuán lái zhĭ shì yī gè mèng]
Implies a poignant epiphany of a painful truth—when what once seemed perfect and real turns out just an illusion ('later on I found it was merely a dream'). A reflection on regretful loss or disillusionment, acknowledging reality isn't always what we hoped it would be.