I alway love coming to 100% Korean. Theres a cool grandpa and his daughter? that works there. They're both super nice! you might have to speak a bit louder for him. Sometimes it may seem like the chef/lady is a bit annoyed but I assure you she's friendly.
The proportions for the food is great! She makes everything on the spot and you can watch her. I love getting their soups, pork ribs+ rice, and tteok-bokki. There is also a two person menu and you can mix and match different choices. You usually get three side dishes and a bowl of rice.
I don't recommend sitting in for this restaurant simply because it is so small. It's more of a pick up/takeout place.
If you are looking to sit in, then leave your trays on the table and they would pick it up. I tried to be helpful and bring my tray upfront but they would tell me politely leave it there. (I make this mistake a lot haha)