Oops, it doesn't look like 'gyehyeon day' is a national day..

Other days

china

China Day
stress awareness

Stress Awareness Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
lost sock memorial

Lost Sock Memorial Day
hiv awareness

Hiv Awareness Day
bonang

Bonang Day
ask out your crush

Ask Out Your Crush Day
special education

Special Education Day
first love

First Love Day
self appreciation

Self Appreciation Day