Korean Four-Character Idioms
유비무환
有備無患
Word for word
“prepared, so no worries”
What it means
If you're prepared, you won't have trouble.
When you'd use it
Packing an umbrella, backing up files.
Example
유비무환이라고, 보조 배터리는 꼭 챙겨.Better prepared than sorry — always bring a power bank.