Koreans are mostly shitcoin degenerates. Ripple is still the biggest market after BTC. Most Koreans buy their crypto on exchanges. It has become more difficult to move them off exchanges, so I would imagine the majority never used a wallet and keep everything on exchange. If ever they leave their exchange, it's to send it to the usual foreign shitcoin casinos such as Binance. Government gave recent amnesty for tax-avoiders keeping their fortune abroad on such exchanges asking them to report their holdings. Many politicians turned out to be huge holders too.

There are some maxis though, from my understanding, they do P2P trades, mostly, if they can't do it within the regulated exchange market.

Kimchi premius is real, but it never got back to the 2017 bullrun levels. You can follow the premium real-time here. It's the 김프 column.