北城以北深海未眠南城以以南思念未归
        
            [bĕi chéng yĭ bĕi shēn hăi wèi mián nán chéng yĭ yĭ nán sī niàn wèi guī]
        
        
            This poetic username describes geographical longing across different locations (north/south of city walls), implying someone remains sleepless in a deep place while another person's thoughts or loved ones never come back.