Dr Sang Lee M.D. is a prolific writer and famous TV personality all over South Korea. He is popularly known among Koreans as the "Endorphin Doctor".

He introduced the hormone endorphin (the happy hormone) to the Korean TV viewers in his lectures broadcasted by major national TV stations such as KBS and SBS. He conducts lectures, seminars and workshops in several countries such as USA, Germany, Australia, Poland and Brazil.

His quirky and informative lectures never cease to fascinate his audiences of any age or background. The moment he starts his lectures the listeners are held captive by his animated and interesting style, the remarkable studies and the rich graphics. His lectures are scientifically based.