Cafe Comma (카페 꼼마) is probably one of the most popular cafes in Hongdae (홍대) area, amongst tourists anyway. Where else can you find a high-ceiling cafe with an entire wall dedicated for shelves filled with books? I believe there are 2 locations of Cafe Comma in Hongdae, one near Hongdae Subway Station and the other one is near the parking lot street. This location is the latter one and a little smaller than the other location. Also, good to know, since cafes and restaurants in Hongdae seem to open their doors at a more later time during the day, this is a good place to go to for an early coffee fix.
I actually came here with two fellow instagrammers that I met for the first time on that day, @noahskim & @hannahmuhh. We spent a whole day hopping from one place to another so you'll probably be seeing them again on my future posts (as well as the previous one if you haven't already :p).