Bluegrass is a Korean restaurant near Gwakji Beach in Jeju that serves onguksu and yeolmu guksu. Egg onguksu, yeolmu bibim guksu, and tteokgalbi yubu sushi can be ordered together. The space is a 140-year-old old house that was renovated over three years, with wooden furniture and tableware made by hand. There is a chair for babies, and dogs can use outside tables if you call in advance.