Ttukbaegi Sundaeguk is a sundae guk restaurant in Seongjeong-dong, Cheonan. It serves sundae guk and suyuk gukbap, and diners can add gochutgaru to make the soup spicy. Water is drawn from a water purifier into paper cups. The gukbap portion is large enough that two people can share it and still have some left, and the interior is worn with age, so it does not suit those looking for a clean restaurant.