Here is an overview of the most important headlines on some major news outlets. I looked them up for you:

Over $100 billion wiped off global cryptocurrency market following talk of South Korea trading ban: https://www.cnbc.com/2018/01/11/bitcoin-ripple-ethereum-prices-fall-after-south-korea-trading-ban-talk.html

South Korea plans to ban cryptocurrency trading, rattles market: https://www.reuters.com/article/uk-southkorea-bitcoin/south-korea-plans-to-ban-cryptocurrency-trading-rattles-market-idUSKBN1F002A

Bitcoin drops $2,000 in value as South Korea announces planned trading ban: https://www.theguardian.com/technology/2018/jan/11/bitcoin-drops-value-south-korea-trading-ban-cryptocurrencies-tax-gambling

There are also some news that South Korea might want to introduce joint regulations on cryptocurrencies with China: https://www.google.at/url?sa=t&rct=j&q=&esrc=s&source=newssearch&cd=3&cad=rja&uact=8&ved=0ahUKEwjL-bWagNDYAhWKKJoKHZCMDwwQqQIIRCgAMAI&url=https%3A%2F%2Fwww.coindesk.com%2Freport-south-korea-eyes-joint-crypto-regulations-with-china-japan%2F&usg=AOvVaw0p0GfyC0kXQV4HQ7mVVB6j