一种属于我最初的执著一种属于我最初的天真
[yī zhŏng shŭ yú wŏ zuì chū de zhí zhù yī zhŏng shŭ yú wŏ zuì chū de tiān zhēn]
It combines a notion of being stubbornly attached to original intentions ('first insistence') with maintaining youthful naivety and innocence ('initial simplicity'). The username reflects holding on to both one's ideals and initial sense of purity as they first set off on their life journey.