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Depends who your principal is but all 3 I've had so far gave me permission to show it (to children between elementary - high school), but this obviously depends on both the impression you make and how liberal he/she is. Top tip for those with tattoos and dont want to wear long sleeves: there's the arm cooler thingy that many 아저시 wear, I use them during summer. Makes it look like I'm staying cool but covers my big forearm tattoo.

The PSU (blocky thing) on your laptop's power cord can handle the electricity from either country's socket, you only need a plug with the right shape. Your best option is just to buy the US version of the second cord that comes out of the PSU and goes to the wall. Cheaper and more convenient than a converter.

Here's an example of what I'm talking about (though check your cord and make sure it's the same).

https://www.amazon.com/gp/aw/d/B07D3SKTC6/ref=sspa_mw_detail_3?ie=UTF8&psc=1

Don't bring a voltage converter. You won't need it. Every laptop and phone charger can run 110-240V. Also, don't bring any device that requires a voltage converter (e.g., kitchen appliances, a blow dryer etc.). Just buy new stuff here.

FYI: A voltage converter is a big, heavy device that plugs into the wall. An adapter is small and just changes the plug. You can buy adapters in Korea for 2,000 won or less.