Ryusenso is a Japanese restaurant in Busan that serves tonkotsu, karai ramen, and gul ramen. The tonkotsu broth is rich, topped with chashu and served with garlic and ginger, and the restaurant also offers shoyu ramen. Meals are served in a cool indoor space even on hot days, and the hood is kept clean. Seating is limited, so there can be a wait during meal times.