Warning Signs in Seoul Apartments: An Increasingly Unsettled Rental Market — “Nowhere to Go If I Leave” (Weekly Money Issues: Real Estate)

An independent exercise, not a statement by the video creator or verification of every claim in the video.

If mortgage interest equals rent, does buying cost the same?

This is an annual-cost exercise, not actual prices or loan terms. Assume a KRW 500 million home, KRW 200 million equity, KRW 300 million borrowing and 4% interest: annual interest is KRW 12 million. A 3% opportunity cost on equity adds KRW 6 million; taxes and maintenance add KRW 2 million; total transaction costs of KRW 10 million spread simply over 5 years add KRW 2 million annually. Ownership costs excluding price changes total KRW 22 million a year. Monthly rent of KRW 1 million costs KRW 12 million annually, assuming no deposit or associated opportunity cost. Interest alone matches rent, but omitted costs create a gap. Under these assumptions, closing it requires annual appreciation of KRW 10 million, or 2% of the KRW 500 million home price. That is break-even arithmetic, not an expected return. Principal repayment is cash outflow that reduces assets and liabilities together, so assess monthly affordability separately from economic costs.

Check for yourself

1. Are financing and opportunity costs of the actual rental deposit and equity treated consistently on both sides?
2. How does the gap change if rates rise or the household moves sooner than expected?
3. Can debt service and living expenses be met while retaining emergency reserves without price appreciation?

Limits of application

All amounts, rates and the holding period are assumptions. Taxes, repairs and transaction costs are fixed simplifications; tax credits, changing interest, discounting, price declines and varying sale costs are omitted. Deposit-free rent is a calculation assumption, not an available property. Nonfinancial values such as tenure security and mobility require separate judgment.