You need to understand why Korean police had raided Bithumb exchange. The report says that the main shareholder of this exchange committed a fraud during issuance of the BXA which is the native token of this exchange. They had raised around 25 million USD through the issuance of the token but did not list that in their platform at an agreed date. Now one of the owners was found transferring funds abroad illegally.

So if possible, transfer your business to any other reputed exchange like Binance because if Korean exchange is involved in such illegal things, there's no guarantee that their global counterpart is safe either. TO know the details of this matter, you can refer to the below article,

https://news.bitcoin.com/major-south-korean-crypto-exchange-raided-by-police-in-alleged-25-2-million-fraud-case/

Hope this helps!