Danish people are the happiest in the world while Koreans rank near the middle, according to a survey by Gallup World Poll.
The survey of thousands of people in 155 countries between 2005 and 2009 found Korea in 56th place. Scandinavians are the most content, with Finland and Norway in second and third, and Sweden and the Netherlands tied at fourth.
Costa Rica and New Zealand shared sixth place, while Canada, Israel, Australia and Switzerland tied for eighth.
Countries with happy citizens tend to have high per capita income and good social welfare systems. However, some countries that are not rich but have strong social networks such as Costa Rica ranked higher than the wealthiest nations like the U.S. (14th) and Germany (33).
Newly emerging economies China and Russia sat near the bottom at 125th and 73rd, respectively. Despite their high per capita income, Japan, Hong Kong and Singapore tied for a low 81st place.