Professor of Internal Medicine, Cardiology Division, Yonsei University College of Medicine Director of Cardiac Electrophysiology Laboratory, Director of Big Data Research laboratory, Director of Bio-drug development Laboratory General Secretary, Korean Heart Rhythm Society, Unfounded Director, Korean Society of Cardiology My present appointment allows full clinical responsibilities in cardiovascular medicine (including invasive and non-invasive cardiology); as well as general medicine, teaching and cardiovascular research. My research interest are in atrial fibrillation, stroke, hypertension, antithrombotic therapy; in addition, I lead a laboratory-based research group (the bio-drug development for arrhythmia) studying exosome, and arrhythmogenesis.