Bithumb is opening XRP wallets on 1 June at 3pm Korean time.
After that, their XRP exchange will open on 2 June.
1) 리플(XRP) 입금지갑주소 생성 : 2017년 6월 1일 15:00
2) 리플(XRP) 거래소 오픈 : 2017년 6월 2일
For anyone else who can read Korean, here is the source:
Hope this helps!