Seoul is 8 hours ahead of Berlin (winter) or 7 hours ahead (summer). When it's 9:00 AM in Berlin, it's 5:00 PM in Seoul. South Korea does not observe DST.
Berlin uses CET/CEST while Seoul uses KST (Korea Standard Time).
Optimal window: 7:00 AM - 10:00 AM Berlin time (3:00 PM - 6:00 PM Seoul). Early morning calls from Berlin reach afternoon business hours in Seoul.
Germany and South Korea have strong trade relations, particularly in automotive and electronics industries.