One day in Seoul | Am I getting my Blue Bottle?

Seoul opened its first Blue Bottle Coffee, on its opening day, I got up early, took a metro there, then turned out there's a super long queue. In case you don't know blue bottle, it should be an American concept coffee house, but extremely popular in Japan.

So, Seoul's first blue bottle coffee is located in Seongsu-dong, since I didn't queue, I was trying to discover Seongsu-dong then, there....wasn't so much to see and I took the wrong bus, a bit of Seoul exploration trip, then I came back to Blue Coffee, hoping there was a chance with shorter queue, but...

Anyone who has ever tried blue bottle, can you tell me if it's really good?