Preppie Coffee Lab Mangwon is on the second floor of a commercial building in Mangwon, Seoul, and serves filter coffee and americano. For the filter coffee, you can smell the beans before choosing, and it arrives in two cups with a fragrant, clean profile. The space is not large but has quite a few seats, including sofa seating toward the back, and quiet music plays. The regular chairs are hard and uncomfortable to sit in for long.