I make monthly pilgrimages to this place and that has got to mean something, right? It's a good sized buffet with fare that ranges from salads and sushi to traditional Korean drinks (i.e. sikhye) and food (kimchi, ddeokbokki, "bulgogi") that's been vegetarianized. They also offer strawberry ice cream, soba, and a decent variety of soup. They only open for set hours and it's 9,000 won for both lunch and dinner. I can tell you now that they pretty much serve the same stuff every day, for both lunch and dinner. :) However, depending on you, note that half of their dishes are cold unless they're on the portable burners; I personally like lukewarm food but this was mentioned to me by my friends.
They also have a nice section where you can buy vegetarian meats and ramen. :) The place is huge and the atmosphere is nice and well-lit.Pros: reasonable price, good variety and delicious, no onion and garlic
Cons: far away