Is there Kpop stuff, also how much is the food in the restaurants?

There is some in the surrounding shops. And more if you go to one of the bigger H Marts. As far as resturants, there is a food court with 5 food stalls, with a bakery as well.

Several of the shops near the exit doors have Kpop merch, I've seen BTS and BlackPink merch for sure and some other cute kawaii stuff as well. Food in restaurants ranges, many many items from a few dollars to 12-15$ a meal/bowl, sushi, soup, bakery, several where they grill all kinds of things. Lots of different options to eat and shop, also they have bubble tea at the bakery