It depends on what price range. You can easily find bulgogi/galbi joint almost every where in town. If you are staying at Westin Chosun, there is a Korean restaurant right across the hotel (Lotte Dept. direction). I am not sure the name but I guess is "hansarang" or something like that. It is operated by sister of a Korean well-known singer and radio personality. If you want something nice, try "Samwon Garden (http://www.samwongarden.com)" in Chungdam-dong. The father of LPGA golfer Grace Park owned the restaurant. Whenever Grace won major tournament, he gave free meal. So, hope Grace won when you are in town.