According to the english translation of a Korean newspaper, the National Tax Service is going to begin taxing some RMT (Real-Money Trading) beginning this July. Trading virtual currencies in for real money is very common in Korea and, as a result, the new tax laws may affect a large number of people.
This "Value-Added Tax" (VAT) will apply itself only to certain ranges of trades. Sellers who do between 6 and 12 million won (around US$6500 to US$13000) every six months in business will have VAT auto applied by transaction's middle-man. Sellers who do more than 12 million won every six months will need a business license and will pay the tax by themselves.
What's interesting about this is that, according to the National Tax Service, it still doesn't officially legalize RMT. An official from NTS, Mr Choi said, "This is not about defining RMT legal/illegal; we don’t see any contradictory facts to Amendment for Game Industry Promoting Law -we are not about to judge if RMT is legal or not".
According to the Terms of Service of most of the games involved, the game producers own all of the virtual currency being traded here and they want RMT to become officially illegal. RMT companies have been a powerful lobby group for some time, and this new tax likely comes by way of compromise after they agreed to share information with the governement on the identities of major currency traders.
Expect this to further escalate as the game producers use this event to gain legal leverage, and the RMT companies do the same.