Keep going straight for 10-15min, the cafe would be on your right
The place was really packed when we got there in the afternoon (all fans, no doubt about that), would probably go a little earlier next time. The waffles and 빙수 looked really good too! You can add bubbles to your drinks as well. The drinks and food are a tad bit expensive but that's probably the norm for most of the cafes in the Gangnam area~ The cafe is a little cramped, but nice atmosphere and cool space nonetheless~
The drawings on the cups are drawn by Kai! They're so cute I really wanted to bring them home. Kai's sister is really nice, they have almost the same smile :-)