This was the first Korean restaurant I ever went to, and it's still my favorite. It's a tiny, hole-in-the-wall place that's basically on the OSU campus, but it has wonderful food! Since it caters to the campus crowd, it's not a fancy place, but it is affordable, tasty, and comfortable. We even took a large group there without any trouble.
There are all sorts of interesting foods to try, some of which may seem a bit strange at first, but they're great when you're feeling just a little bit adventurous. Some entrees come served in a piping hot stone bowl which steams and sizzles when they pour in the broth, which our kids really enjoy. Casual, affordable, tasty, and judging from the number of asian-americans eating there it must be fairly authentic. It's one of our favorite little dives.
Pros: interesting menu, casual, inexpensive
Cons: tiny, translation a bit off, no parking (campus)
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