Astronomers Coffee is a small cafe selling coffee and beans, located beside the Gyeongui Line Forest Trail between Hongdae and Hapjeong. Customers can choose between beans with acidity and beans with depth, and the cafe also serves iced drip coffee that brings out the flavor of Ethiopian beans. Takeout orders receive a discount, and customers can pick beans and order them as drip coffee. The semi-basement interior is dark and has few tables.