Jeongseongok Mapo Seongsan serves donkatsu, jjamppong sundubu, sundae gukbap, and kongguksu in Seoul. The donkatsu is crispy, the jjamppong sundubu has good flavor, and the kongguksu is eaten cold. The restaurant opened recently, so it is quiet with few customers, and the set includes jeonbyeong. Seasoning is moderate, side dishes are refilled, and portions are decent.