소 잃고 외양간 고친다
From Korean Wiki Project
Contents
Literal Meaning
After losing a cow, one repairs the barn.
Usage
Do not regret a mistake after it is already made, one should try to protect oneself before encountering misfortunes.
Most of the low middle income families in the coundtry owned a "Soh" and "oeyangkan" in the olden days.