If you're looking for decent Korean fare in the area, Eomma Jipbap in Grantral Mall is a good option! They have affordable lunch sets going at $10.90 and it was pretty decent.
I had the Spicy Cold Beef Noodle Set ($10.90) which came in a pretty large bowl. The noodles weren't the most authentic, but they were decently chewy with a texture similar to cold soba noodles. The cold soup itself was tangy and savoury, not too bad! The grilled beef may be a little tough, but they do pack quite abit of flavour. I wouldn't say the quality is amazing, but quite value for money.
Their Kimchi Pancake ($11.80) was chewy and quite tasty as well. Glad it wasn't too thick and it was thin enough to be slightly crispy on the edges.
An affordable lunch option if you work around the area!