Simple and delicious.
Essentially you're here for the dak galbi. They mix chicken/seafood, cabbage, and some sort of kimchi / chili sauce on a hot plate. It's a good idea to add rice cakes, noodles and cheese.
I have no idea how this measures up in terms of authenticity, but it tastes good, and makes for an interesting experience.
Servers are friendly, but have a ton of people to look after when it's busy. Be ready to vigorously flag them down.