In an effort to facilitate tourism in South Korea, the government tourism site offers Free Volunteer Guides! http://visitkorea.or.kr/ena/GK/GK_EN_2_7_3_1.jsp
I had a one-on-one local explain the history, culture and geography of Seoul. He was on time to our meeting place, professional and very informative. I couldn't have asked for a better guide. My only regret is that he couldn't come along with me for my entire stay in South Korea.