Korean Calendar

People in South Korea today use the most widely held Gregorian calendar like the rest of the world. Before the 20th century, a lunar calendar (lunisolar calendar) was used in Korea. Even today, Koreans celebrate the New Year based on the lunar system called Gujeong, meaning the traditional New Year. There is a myth that it is bad luck to move, get married, or open up a business on a day with sohn. The word sohn means guests and by "guests" it means either ghosts or the devil. Even in the 21st century, many people in South Korea move strictly on "days without guests" for good luck.