Crumble Roasters is a small cafe in Imun-dong, Seoul, serving hand-drip and espresso drinks. It offers a different hand-drip coffee each week, along with lattes and drinks topped with cream. The cafe runs mainly on takeout, and outdoor seating is available briefly when the weather is good. It sometimes closes early, so call ahead to check whether it is open, and the small hall makes it hard to study there for long hours.