It's the Korean concept that could change your interpersonal relationships. It lies at the heart of "saving face". Nunchi (pronounced Noon-chee) in Korean means "eye-measure". We all know people who can enter a room and "read" the people in it with a sweep of the eye. Euny Hong is the author of the book, 'The Power of Nunchi: The Korean Secret to Happiness and Success', and is a journalist who has written for The New York Times, The Washington Post and The Wall Street Journal. She tells Michelle Martin why Nunchi is the Korean 5,000 year old secret to doing well in life.