Here, follow this link. I believe its South Korea...
If you live outside South Korea
You should request a Criminal History Information Record (Bumjoi Gyung-ryuck ·Soosa Gyung-ryuck Jo Hoi Hoibo-seo, from a police station in Korea. Immediate family members (parents, spouses, siblings) may request a certificate on your behalf. Please note all police certificates should include all records, including any lapsed records. Original police certificates must be submitted.
http://www.cic.gc.ca/english/information/security/police-cert/asia-pacific/korea-south.asp