Lunar New Year's Day
Lunar New Year's Day is the one of the 2 biggest holidays in Korea(another one is Chuseok). Through these 2 biggest holidays, very many Korean people travel to visit families.
It's usually 3 days off(Lunar New Year's Day is in the middle and the former and the latter date is also off), but this time is including Saturday and Sunday, so January 30 is also off.