South Korea → Germany
South Korea plugs
Type C
Type FGermany plugs
Type CType FShared plug types: C, F
Compatibility: Compatible
Voltage — South Korea 220V — Germany 230V
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.