In the street that Koreans go to for jajangmyeon (black bean noodles), it's nice to have a vegetarian version of it available. Jajangmyeon is technically Chinese food, but much more popular in Korea. Its popularity in Korea is said to have begun at a restaurant just across the street from Shu Shi Yuan. That building has since been turned into the Jajangmyeon Museum. A filling lunch of the veg noodles was only 6000, quite a good price for a meal in Chinatown. The menu also had a wide variety of (much more expensive) soy and mushroom meats.
Also, the directions in the first review seem to be the long way around. The map is correct. From Incheon Subway Station walk through the Chinatown gate and proceed to the main intersection. Turn right, follow to the end and you will see the restaurant on the left beside a large Catholic church. There was no English sign up when I went in May, 2014.