There's nothing common about this exceptional coffee and wine bar. Stylishly decorated, with an ubercool vibe, comfy sofas and friends dissecting existentialism over a glass of red wine, it's on the 1st floor of the architecturally intriguing Golmok (골목) complex. For something less Sartre and more Chomsky, try Nogada, the downstairs beer bar.
From the metro station, turn right at the first street then left at the second street. It's tucked away on a lane halfway down the road on the right side.