北城以北心海未眠南城以南思念未归
[bĕi chéng yĭ bĕi xīn hăi wèi mián nán chéng yĭ nán sī niàn wèi guī]
The north side of Northern City and the south side of Southern City both refer to distant places. “Heart Sea” indicates inner world; “Missing” here suggests the sentiment hasn't come back yet after a long time. Overall, it implies yearning for and waiting for someone or something.