Plugs & voltage in South Korea
Types C and F · 220 V · 60 Hz
It pairs 220 V with 60 Hz, a combination shared only by Peru, the Philippines and Saudi Arabia. South Korea is the only country in Eastern Asia with this plug set; the most common set there is A/B (2 of 6 others). In Eastern Asia, only Taiwan also runs at 60 Hz; the rest use 50 Hz or both.
Do I need an adapter for South Korea?
Where are you travelling from?
Adapter, and mind the voltage.
220 V here, 120 V at home.
Bring an adapter to Types C or F.
Plug straight in.
Bring an adapter to Types C or F.
Bring an adapter to Types C or F.
Bring an adapter to Types C or F.
Type C plugs fit; Types D and M plugs need an adapter to Types C or F.
Adapter, and mind the voltage.
220 V here, 100 V at home.
The power supply
Same plugs as South Korea
39 other countries use exactly C/F: 28 in Europe, 9 in Asia and 2 in Africa.
The plug types used here
Guides: 230 V vs 120 V countries · The 15 plug types explained
Source: Wikidata Q884; regions: UN M49 (Eastern Asia). Sources & method