We saw this in Insa-dong this past weekend. They’ve actually been there for a few months. The Insa-dong and Jongno areas tend to be where new street foods are introduced, outside of Myeong-dong. That’s where the Chuncheon-style dalkgocchi (chicken on a stick) started, where they grill thick morsels of chicken and veggies over charcoal. It’s also the home of some of the most popular hoddeok in Seoul, with lines around the cart. I think the secret is they use corn meal in the batter.