When they say hole-in-the-wall and mom & pop, they must have been thinking of places like this. It does seem like a one woman show although I caught glimpses of at least one elf in the kitchen.
I'm not sure why a place like this has teriyaki and katsu on their menus but my family decided on chicken teriyaki, beef teriyaki, chicken katsu and soon tofu. The chicken katsu came out last and it seemed like it was smothered in a strong teriyaki sauce. However, it was far better than my older son's chicken teriyaki whose chicken meat tasted weird to me. I think the beef teriyaki came out fine. I was sharing two dishes with my youngest and it was beef teriyaki/chicken katsu. The chicken teriyaki was so inedible for my oldest that I wound up giving him the remainder of my chicken katsu. This leaves the soon tofu which my wife ordered and enjoyed. Since she's hardcore when it comes to Korean food, it must have been pretty good. Some fish was provided but I honestly don't know why. My wife and kids enjoyed it.
I couldn't help but admire the server's energy as she hustled plates off tables, cleaned tables, brought food, took orders, directed customers to tables and manned the cash register. It is quite the sight and I enjoyed it as unintentional entertainment. I think this place was another learning experience for me. It teaches me again to order the proper things from places even when they offer the improbable.