尔为尔，我为我

Explanation: Seoul: you. You are you, I am me. Refers to the clear boundaries between each other is not detached 　　Usage: As object, attribute, clause; for oral 　　Source: Warring States Zou Meng Ke, "Mencius lla": "Seoul is Seoul, and I'm me, though Tanxiluocheng on my side, Mei Er how can I indeed!" Thesaurus:  you You, me It's me. (=It is I.)