On this Site, you can find continuously updated links for internship searches.

http://www.kopra.org 
Internship placement/ East Asia

http://korea.ahk.de/  
Korean-German Chamber of Commmerce and Industry

http://www.kas.de/proj/home/home/65/1/index.html  
Overseas offices of the Konrad-Adenauer Foundation in Korea

http://www.fu-berlin.de/jobportal  
Job and internship offerings in Korea

http://www.daad.de  
Support offerings through the German Academic Exchange Service