Gaeseongjin Chapssal Sundae is a Korean restaurant in Seoul that serves sundae-guk. It also serves sundae-guk jeongsik and eolkeun sundae-guk, with dadegi and seasoning sauce mixed in by default. Eolkeun sundae-guk is spicy enough to make you sweat, and sundae comes with the sundae-guk jeongsik. If you do not want dadegi mixed in, tell the staff before ordering.