금석지감이 · 금석지감을
a strong sense of how things have changed between then and now
Example
고향에 다시 가 보니 금석지감을 금할 수 없었어요.
Returning to my hometown, I couldn't help feeling how much had changed.
Word parts
금 now+석 past+지 of+감 feeling
Literally 'the feeling of now versus the past'.
Good to know
Don't confuse 금 'now' here with 금 'gold' in 금석 'metal and stone'.
Related words