Gaecheonjeol - National Foundation Day
October 3 celebrates what Koreans call Gaecheonjeol, National Foundation Day. Meaning "Opening of Heaven," it is a time where all Koreans celebrate the creation of ancient Korea. The basic belief was that Danggun Wanggeom, grandson of heaven, founded the first kingdom of Korea in 2333 BC. With that he established the first state known as Gojoseon, and throughout the centuries, this day has come to be known as Korea's birthday.