Suhrabal

If you're tired of Korean BBQ options with very few items on the menu and want to try something slightly more adventurous (e.g., kimchi mandu) I recommend Suhrabal. It's not open very late, and it's not all you can eat, but the meat is grilled right in front of you with onions, mushrooms, and garlic, and it's pretty tasty :)

Despite the murder which happened there recently (see link), the atmosphere is pretty pleasant and low-key: I appreciate the large private booths, dim lighting, and sounds of the running fountain.