Mizu Coffee is a coffee shop in Gunsan that occupies the former building of a Japanese trading company next to the Gunsan Modern History Museum. It serves coffee such as americano, latte, and cappuccino, along with cake, and the first floor has standing tables. The building was constructed in the 1930s and renovated, and the second floor is a tatami book cafe where visitors take off their shoes before going up. The coffee aroma is weak.