개과천선이 · 개과천선을
turning over a new leaf; reforming oneself
Example
그는 감옥에서 나온 뒤 개과천선해서 성실하게 살아요.
After getting out of prison, he turned over a new leaf and lives an honest life.
Word parts
개 correct+과 fault+천 move+선 good
Literally 'correct your faults and move toward good.'
Related words