Korean Four-Character Idioms
사필귀정
事必歸正
Word for word
“things always return to what's right”
What it means
In the end, the truth wins out.
When you'd use it
When the truth finally comes out in someone's favor.
Example
누명을 벗었구나. 역시 사필귀정이야.You've been cleared. The truth always wins in the end.