困不住的人守不住的城
[kùn bù zhù de rén shŏu bù zhù de chéng]
Refers to 'Uncontainable Person, Unguardable City'. Symbolically referring possibly to oneself who's wild/free/unrestricted or a situation/location that no matter how hard anyone tries to maintain control it cannot be held onto - emphasizing fleeting nature whether pertaining specifically personal boundaries or wider contexts such as urban life transitions.