Tenants facing a sudden blow... what happens next?

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

Faster growth is not the same as exceeding income

Suppose a hypothetical household has monthly income of KRW 5 million and interest expense of KRW 200,000. Over the same period, income growth of 3.9% produces KRW 5.195 million, while interest growth of 18.6% produces KRW 237,200. Interest grows much faster, but its share of income rises from 4% to about 4.57%; the interest amount has not exceeded income. Income minus interest alone rises from KRW 4.8 million to KRW 4.9578 million. This is before living costs and must not be called savings capacity. In a personal budget, subtract principal repayments, rent and essential living costs as well, then compare the remaining amount under lower income or the next rate reset.

Check for yourself

1. Do the original amounts and periods behind the two growth rates match?
2. Have you confused monthly interest with total principal-and-interest payments?
3. How long can the remaining cash after living costs and emergency reserves withstand higher rates or lower income?

Limits of application

This is a same-period calculation for a hypothetical household, not a reproduction of the video’s statistics. Average growth rates for different groups do not describe one household’s change. Taxes and other expenses are excluded; actual strain depends on loan balance, repayment method, income stability and lease terms. A positive balance alone does not establish that buying a home is safe.