I give it 5 stars because of what I get for the price. Every dish here is under $10 before tax and they come with a generous portion too. Every dish comes with at least 2 side dishes of kimchi..
The quality of the food is as good as it gets for under $10.
Try the Bulgogi dishes and the Budae Jigae. By far best Budae Jigae.
Also try the Omu Rice. It's their version of omelet fried rice. Fried rice is wrapped in omelet egg.
I'm an easy going customer so the owner being not too friendly is not a big deal to me. In fact, what do you expect at a no-waiter restaurant? You don't have to pay tips already.