It seems Korea has xmas/new year holiday, luner new year week, winter break for school, colleague (not sure about this)....
Just check google lol
Mid-December – end of January: Winter vacation (for middle and high school), (usually late December/early January to early March). Some schools will have winter break from early/mid December to early February,
December 25: Christmas
January 1 – 2: New Year’s Day
January 22 – 24: Lunar New Year*
One week in late February: Spring vacation (for middle and high school)