After having sent my 3 children to bilingual German School Seoul International DSSI (
http://www.dsseoul.org/) for the last 4 years I can strongly recommend this school to anybody looking for a decent international private school for children from age 3 (Kindergarten) to age 18 (Highschool).
DSSI, located in Hannam-dong, Yongsan-gu, Seoul, is a German government-approved and supported official German School abroad and has been awarded the seal or excellence in 2011. It offers excellent bilingual German-English education based on German curricula to students of all nationalities.
Children in Kindergarten and Elementary School can enroll without prior knowledge of German and will receive special tutoring for fast acquisition of this language.
Graduation from DSSI with "Deutsche Internationale Abiturprüfung" DIAP entitles graduates to study at any university in the European Union and in many other countries around the world.
Will be happy to answer questions.