One Star Old Fashioned Hamburger Children's Grand Park is a burger restaurant near Children's Grand Park in Gwangjin-gu, Seoul, serving American-style handmade burgers and sandwiches. Its cheeseburger and patty melt use thick, juicy patties, and it also serves chili cheese fries and onion rings. Food comes out quickly after ordering, and the dining room is decorated in an American diner style. Burgers and sides are paired with beer.