There's still P2P trading. The only non-custodial, KYC-Free P2P trading platform that supports Litecoin is LocalCryptos.com.

There's a surprisingly high amount of LTC/USD trading (and for many other fiat currencies too) with decent spreads (well, decent, for P2P trading).

Because of the low network trx fees w/ Litecoin, that coin is sometimes what buyers will use to "on-ramp", and then use a swap service to convert into some other coin (e.g., using (e.g., coinswap.click, that LTC can be converted to bitcoin on Lightning network ⚡), or deposit the LTC to a "crypto" exchange and do whatever from there.

There aren't any LTC/KRW offers yet (either buy or sell) currently, but I suspect that pair too will see some liquidity found on LocalCryptos as a result of these delistings.