You cannot strike a face that is smiling.
More Korean Proverbs:
A man's youth will never die, unless he kills himself.Korean
A sheet of paper is lighter if two of you don't try to carry it.
Korean
The bull that is used to the sun shivers by the light of the moon.
Korean
Even a monk can't shave his own head.
Korean
Do not draw your sword to kill a fly.
Korean
Cross even a stone bridge after you've tested it.
Korean