2895 Broadway (across from Columbia University)
Supposedly, Mill Korean used to be a fairly traditional diner serving Columbia University students until a Korean employee became the owner and turned it into an outlet for his home-country fare. Korean in the city has a tendency to be surprisingly expensive, but this one has been reasonably-priced and generally tasty. The atmosphere is also fairly pleasant. I'm particularly partial to the chab-chae.
Next: Mokja Korean Cuisine