南城以南少年愁北城以北少年梦
[nán chéng yĭ nán shăo nián chóu bĕi chéng yĭ bĕi shăo nián mèng]
This username conveys a sense of contrast and distance in the journey of growing up, where 'South of the Southern City' is associated with adolescent sorrows while 'North of the Northern City' represents youthful dreams and aspirations. It poetically reflects on different phases of life.