was just looking at the menu of one of the places i enjoy... unfortunately, it's not in the city, but they have 2 of the 3 items you wanted:
(dalk) kalguksu (avail during lunch)
son mandu (steamed and fried)
and duk mandu gook
only had the mandu here, and they feel/taste homemade. whatever that means.
Don Don
1177 Elmhurst Rd.
Des Plaines, IL 60016
T: 847-981-5220
(North of Algonquin on Elmhurst)