Im Byeongju Sandong Kalguksu is a kalguksu restaurant in Yangjae-dong, Seoul, serving bajirak kalguksu and kongguksu. The bajirak kalguksu has thick, chewy noodles in a spicy, cool broth, while the kongguksu has a creamy, foam-like texture. Lines form, but the wait tends to move quickly. Arriving late means a longer wait.