I am a professor currently in the Department of Internal Medicine, Yonsei University Wonju College of Medicine. I have been provided medical treatments and researched mainly on gastroenterology and hepatology for over 15 years. My specialized areas are liver sinusoidal endothelial cell pathophysiology and related hepatic fibrosis and I have worked on preclinical studies on the mechanism of endothelial dysfunction/portal hypertension. Recently I have focused on cell therapy by using stem cells for hepatic fibrosis and angiogenesis. I am also interested in non-invasive diagnosis of hepatic fibrosis or portal hypertension using contrast-enhanced ultrasonography. From the clinical research point, the impact of gut microbiota on cirrhosis/portal hypertension and the application of treatment is one of my main research projects.