Don’t Panic is a café during the day and a bar during the night. In practice, though, its identity seemed a little murky when I visited — even though it was already set up as a bar by the evening, the lighting was much too strong. It made me feel as if I was sipping on my cocktail at a café awkwardly before going to work. If you're looking for a more "serious" bar, you can just walk upstairs, though; Big Blue located on the second floor encompasses a classy-yet-chill vibe with a professional staff, serving cocktails, steak and pasta (while the drink menus at both venues are supposedly the same, Don't Panic was low on a lot of its liquor selections when I visited).
I tried the Irish coffee, and the mix of espresso with Jameson whiskey, topped with pre-made (refrigerated) cream, was actually served cold. I didn't like the fact that it's served in a plastic cup when it wasn't for a takeaway, but it was just sweet, bitter and refreshing enough.
Would I come back here? Probably, only for coffee, during the day. For drinks, you might want to head up to Big Blue instead — or, to Ox located in Hannam-dong, which is latest venture of the bar owner.