Professor Seong is one of a few who pioneered radiotherapy of Hepatocellular Carcinoma. She has devoted her entire career to the radiotherapy of HCC by practicing, educating, and pursuing clinical research. With her enthusiasm and devotion to overcoming a minority issue not only in the specialty (radiation oncology) but also in gender (women).

She has served as the president of the Korean Liver Cancer Association. Additionally, she is the president-elect of the Asia Pacific Primary Liver cancer Expert (APPLE) association, which is a world-leading liver cancer association.