UPDATE: Went there 2 weeks ago. They changed the kind of chicken they used for the Ginseng Chicken. Very disappointed with it. The chicken has no taste, the soup had no taste, can't even see any ginseng in it.
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It's a very authentic and humble place. No fancy decorations nor fancy eatery. However, the food is very good, especially those cooked at the table. Their signature ginseng chicken is a must. Ginseng taste is not too strong (it was stronger before, guess they changed it over the years to cater for most people). The chicken is tender but not too tasty. It is best to eat with their homemade hot sauce. However, the best part is the soup which they used to cook noodles and congee after you eat the chicken.
Other dishes like bulgogi, BBQ duck (available on the board), lamb stew are all very good. They make a very yummy fried rice with the remaining sauce when you finish the lamb stew.
Service can be slow when they're busy. Only 2 girls work in the front, but they are extremely nice! The owner will also come out to take care of his customers when he's not tied up in the kitchen. Not to mention the price is unbeatable!
Only downside is they have specials written in Korean only on a board at the back. You may have to ask what's on it if you don't know Korean.