Deep Blue Lake is a cafe in Mangwon, Seoul, that serves specialty coffee in front of the Mangwon Market public parking lot. It offers lattes and brewed coffee, with a choice of one of three beans, and uses a cup that collects aroma. Orders are placed on the first floor and drinks are had on the second and third floors, and it is better to take a seat before ordering. There are not many seats, so places to sit are lacking.