I'm offended by your statement.
First, South Korea has a burden sharing agreement for the US military presence there. A simple google search turned up this article on Politifact. So no, South Korea doesn't get free military defense from the USA. Korea helps cover at least some of the cost ($678M according to the article).
http://www.politifact.com/truth-o-m...-trump-says-south-korea-doesnt-pay-us-troop-/
Second, South Korea is an ally with the US, as both military and trading partners. South Korea sent over 300,000 troops to support the US and UN forces during the Vietnam War. South Korea was also the third largest military presence in Iraq, after the US and GB. The two countries recently signed a free trade agreement. As a friendly country to the US, I find it offensive that you imply Korea is free-loading off its friend.
Finally, Korea has a culture as rich and vast as other Asian countries. It actually is a popular tourist destination area in Asia. According to Wikipedia, it was the 36th most visited city in 2007.
http://en.wikipedia.org/wiki/Tourism_in_South_Korea
I also fail to understand your logic behind Korea only getting revenue from industry so it would be unable to subsidize industry. There are several different industries that provide revenue to the Korean government. Wouldn't the government be able to subsidize one industry over another? ie. revenues from tech industries provide bailout funds for auto industry?
In any case, you should be more careful with your assumptions as they can be offensive to some people.