Korean in the Western Suburbs?
Not sure if it is still there, but Cho Dang Tofu House in Naperville's Ogden Mall (near Kmart and Ogden 6 movie theater) is authentic Korean. Joy Yee in Iroquois Mall just accross the road from Kmart serves a variety of good Korean dishes.
Also, if you haven't been to Nagoya sushi/seafood buffet on Route 59 just south of Aurora Ave, try it. Many seafood items in Korean, Chinese, Japanese, styles or dishes
1221 W 33rd Pl, Chicago, IL 60608