北城以北深海未眠南城以南思念未归
[bĕi chéng yĭ bĕi shēn hăi wèi mián nán chéng yĭ nán sī niàn wèi guī]
The user might be using poetic geographical metaphors, possibly reflecting deep-sea insomnia north of Northern City, contrasting loneliness and unresolved longing felt in Southern City which lies southward.