When I was in Japan fifteen years a go. The Japanese professor said to his students"if we want to be better than the American and the European, we must work hard and do not sleep. To day in Korea the professor said to his students work hard on Monday, Tuesday, Wednesday, Thursday, Friday, Friday and Friday. .... Meaning no weekend and working hard everyday. I have to follow them too. Why they are working hard? May be they have hard time in life and very high competition!