The delivery status of your EMS, International Parcels can check the sites below.
Site address : http://service.epost.go.kr/iservice/ems/ems_eng.jsp
1. When you access the site you see the Pop-Up, just canceled button(right button) click.
2. You can write(enter) your tracking number into the field - Item Number.
3. You can select Tracking Type - International Parcels or EMS item.