Jeongguksu is a noodle shop in Busan that serves janchi guksu and deulkkae kalguksu with chives as the base. It also offers mandu dishes such as bibim mandu and fried mandu, along with kongguksu. The kongguksu uses soybean broth ground in-house, giving it a nutty flavor. The shop opens at exactly 11 a.m., and mandu and soybean broth are available for takeout.