天长地久子虚乌有
[tiān zhăng dì jiŭ zi xū wū yŏu]
This username combines two contrasting concepts: 'eternal and everlasting' (tian chang di jiu), implying something lasting forever, and 'nothingness or imaginary' (zi xu wu you). The user may express a feeling where despite hoping for longevity, some things are ultimately fleeting or non-existent.