Germany → South Korea
Germany plugs
South Korea plugs
Shared plug types: C, F
Compatibility: Compatible
Voltage — Germany 230V — South Korea 220V
Voltage difference is small. Most electronics will work safely.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.