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How to read these numbers

Deposit —

refundable in full at the end of the term, typically around 10× the monthly rent. It is capital parked with the landlord, not a cost.

CAM —

common area maintenance, billed monthly on top of rent. It usually covers building management, security and common-area utilities, but not your own electricity.

Net vs leasable area —

rent is quoted on leasable area, which includes a share of lobbies, corridors and cores. Efficiency is the ratio between the two — 45–55% is normal in Seoul.

All-in per py —

rent, CAM and the imputed interest on the deposit combined into one monthly figure per py of net area, so buildings can be compared on a single number. 1 py = 3.3㎡.