The difference in 110/220V wiring and 220/230V wiring is that -- for 110/120V -- the white wire is not really "hot" and, instead, is a "common" wire that ultimately gets attached to the common or ground lug bar in the wiring panel, while -- for 220/230V -- the white wire in the cable is truly "hot" and ultimately gets attached to a circuit That means the Volt changes from positive to negative, and from negative to positive voltage, this process converts 50 (60) times/second. The electricity of single phase 110v, 120v, 220v, 240v, and three phase 380v, 400v, 415v, 440v, 460v, 480v AC power, are 50Hz or 60Hz frequencies. The speed of 50Hz (60Hz) 2 poles synchronous motor generator
The face of your plug indicates that it is not rated for voltages above 125V. You should not use that plug in a 220V application. You would be better off purchasing a new cable that is rated for 220V or greater. I think this cable or similar would be suitable for your power and voltage needs.

Mains voltage in the UK is actually 230V ± 10%, so 220V falls within this range. Note however that our mains frequency in the UK is 50Hz AC whereas apparently in Korea it is 60Hz. You will need to make sure that your appliance can handle both.

If the power *cord* is labeled 125V 7A, it is intended for 125V operation. You *should* buy a power cord rated for 220V, although in actual practice, a 125V cord with a plug adapter can run on 220V outlets. BUT, it's important to also verify the power adapter ("brick") will operate at 220V.

In the USA they have a mixed 120V/240V system which is why you can wire up a 240V outlet or a 120V outlet. However, in Europe there is only 240V (or 230V - whatever, close enough). To get 120V you need to transform it somehow - you can't do it just by shuffling wires around. Even in the USA, they use transformers to make the two different voltage.
uMAKly.
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    • can i plug 230v to 220v