If you're really craving korean food late at night, then Owl will do the trick. But other than that, there are better options around. The food is not bad, but not particularly great either.
I recently had the Dolsot Bibimbap. The portion is decently big, but flavour is just okay. Not enough meat.
I also had the jeyeukbokum (spicy pork on hot plate). Consistent with the rest of their menu, it was just okay. I've had better, but I've also had worse.
Their prices are just standard too, not cheap, but not expensive either. You could find higher quality korean food for the same price. I'd say their highlight is their gamjatang (pork bone soup). Everyone loves it and I think it's great too. The price is also quite cheap, only a little more than $10.
All in all, it's a decent restaurant thats quite convenient since there's so many locations open late at night. The servers are nice too.