Daeboreum

Daeboreum (Jeongwol Daeboreum) is the 15th day of the first lunar month of the Korean calendar. This is a traditional holiday in Korea. The moonlight is the symbol of light which sends away the dark, disease and misfortune. 
When full moon rises to the sky at Daeboreum, it is believed that the first person to see it will have good luck all year.